Tank Reverso - Double-Face Reversible Quartz, 24.5x40mm Rectangular, Sapphire Crystal, Leather
The Specht and Sohne Tank Reverso (SP0035) is a reversible-case rectangular dress watch with two distinct dials on opposing faces - flip the case on its strap to reveal a completely different dial presentation. The 24.5x40mm rectangular case in 316L stainless steel runs on Japanese quartz behind sapphire crystal, with genuine leather strap, hook buckle, and 5 ATM water resistance. The reversible case design is an historic complication in watchmaking originally created so the watch could be turned face-inward to protect the dial. Available in White-Black, Black-Turquoise, White-Pearl.
Tank Reverso double face watchSpecht Sohne SP0035 reverso watchReversible case rectangular quartz watchDouble face dress watch sapphire crystalTank style reverso quartz leather watch
Specifications
Japan quartz. Rectangular reversible double-face case. 24.5x40mm, 11mm, sapphire crystal, leather, 5 ATM.
24.5 x 40mm
11mm Profile
Japan Quartz
Sapphire Crystal
5 ATM / 50M
Double Face
Reversible Case
Leather Strap
Roman Numerals
3 Colour Options
Reversible Double-Face Case
The reversible case mechanism allows the watch case to be flipped 180 degrees within the strap attachment frame, presenting the opposite dial face to the viewer. This is accomplished by releasing the case from its frame, rotating it, and securing it on the opposite face. The case sits in a carriage that remains on the strap; only the case itself rotates. The result is two completely different watches accessible from the same strap and frame - two dial designs, two colour presentations, one purchase.
Rectangular 24.5x40mm Case
The Tank-style rectangular case - elongated vertically with clean straight case sides - is one of the most historically significant case geometries in watchmaking, dating from the early 20th century. At 24.5mm wide and 40mm long the case is elegantly narrow - more slender than most contemporary rectangular watches and faithful to the proportions of the original Tank designs. This narrow width sits precisely along the wrist without lateral overhang.
Three Dual-Face Pairings
White-Black: white dial on one face, black dial on the other - the highest contrast pairing, creating maximum versatility between a light formal face and a dark formal face. Black-Turquoise: dark dial paired with a turquoise dial - the most colour-expressive pairing, moving from a conventional dark formal presentation to a distinctive teal-blue contemporary face. White-Pearl: white dial paired with a pearl-finish dial - the most subtly differentiated pairing, with two light-tone expressions that differ in texture and luminosity rather than colour.
Sapphire Crystal with Luminous
Sapphire crystal over the active dial face with luminous dial elements and hands. At 24.5x40mm the luminous hands and dial markers ensure readability at a glance. Sapphire provides long-term scratch resistance appropriate for a watch that will be handled at the case level when flipping between faces - the crystal needs to remain clear after years of contact with fingertips and surfaces during face transitions.
The Reversible Case: Two Watches in One
The Reverso concept originated in the early 1930s, designed so that polo players could turn their watches face-inward against the wrist to protect the crystal during play. The case-reversal mechanism became a signature of the design: the case sliding and rotating within its frame to present the metal caseback to the outside while protecting the dial. Later watch designers explored the dual-face potential - if the case can be flipped, why not put a second dial on the caseback? The Tank Reverso by Specht and Sohne operates on this same principle: a 24.5x40mm rectangular case in a carriage that sits on the leather strap, reversible to present either dial face. The mechanism is mechanical and satisfying to use - the case slides out of its frame, rotates 180 degrees, and locks back in place. The three colour pairings (White-Black, Black-Turquoise, White-Pearl) each offer a different relationship between the two faces: maximum contrast, colour expression, or subtle differentiation. In each case the wearer gets two distinct dial personalities accessible without removing or changing the watch - the reversal takes seconds.
Available in White-Black, Black-Turquoise, White-Pearl. Backed by Wclocks 1-year warranty.
Wear It For
The double-face Tank Reverso suits the dress wardrobe, formal occasions, collectors, and those who want two watch characters in one.
Two Dresses for One Formal Wardrobe
White-Black provides a light formal face for day and business dress and a dark formal face for evening and formal events - without carrying a second watch or changing straps. The reversal takes moments; the two presentations are genuinely different. This is the most practical versatility in any dress watch in the Wclocks range.
Dress and Contemporary
Black-Turquoise provides a conventional dark formal face and a distinctive turquoise-teal face for contemporary and casual-smart contexts. The turquoise face is the more unusual of the two - it reads as a bold colour statement in the same case geometry that produces the conservative dark formal face on the reverse.
Watch Collectors
The reversible case is a watch complication in its own right - it requires mechanical understanding and produces a result (two dials, two presentations) that no other case design can achieve. For collectors, the Tank Reverso represents a specific design lineage worth having in a collection independently of its practical versatility.
Gift of Versatility
A reversible double-face watch is a gift that demonstrates understanding of watch design history. For a formal-dress recipient who might otherwise receive a single-dial watch, the Tank Reverso offers two presentations in one piece - a recognition that wardrobe needs vary and one watch face is not always enough.
Explore More at Wclocks
Browse the full Specht and Sohne range and dress watch collection at Wclocks.
Frequently Asked Questions
How does the reversible case work?
The reversible case sits in a rectangular frame (carriage) that attaches to the leather strap. To flip the case: apply slight lateral pressure to slide the case out of the carriage, rotate the case 180 degrees in your fingers, and slide it back into the carriage in the reversed position. The second dial face is now presented. The mechanism is smooth and takes seconds once practiced. No tools are required. The case clicks securely into both positions.
What are the three colour pairings?
White-Black: white dial on one face, black dial on the other - highest contrast, maximum versatility between formal light and formal dark. Black-Turquoise: black dial on one face, turquoise or teal dial on the other - moves between a conventional dark formal face and a colour-expressive contemporary face. White-Pearl: white dial on one face, pearl-finish dial on the other - the most subtly differentiated pairing, offering two light-tone expressions with different surface textures and luminosity rather than contrasting colours.
What does the rectangular 24.5x40mm case wear like?
The 24.5mm width is narrow - significantly more slender than most contemporary rectangular watches which typically run 28-35mm wide. This narrow form sits precisely along the wrist's vertical axis and disappears under a shirt cuff at 11mm thickness. The 40mm length is appropriate for the vertical wrist axis. The overall impression is of a classic, elongated, historically faithful rectangular case proportion rather than the wider modern interpretations of the Tank form.
Does it have Roman numerals on both faces?
The Tank Reverso features Roman numeral dials with luminous elements - the exact configuration of each dial face varies by colour variant. The watch is designed so both faces are complete time displays; the reversible function would be impractical if only one face were fully legible. Both faces include the Japanese quartz time display accessible behind the sapphire crystal that is presented on the active face.
What is the water resistance?
5 ATM / 50M - rated for daily wear including hand washing and rain. The reversible case mechanism requires the case sealing to remain effective in both orientations; the 5 ATM rating confirms this. Not rated for swimming or diving. The leather strap should be protected from extended water exposure.
Is this related to Jaeger-LeCoultre Reverso?
No. The Tank Reverso by Specht and Sohne is an independently designed watch inspired by the concept of the reversible case format historically associated with the Jaeger-LeCoultre Reverso. This watch is not made by, affiliated with, or endorsed by Jaeger-LeCoultre in any way. The reversible rectangular case design is a watchmaking concept that multiple independent watchmakers have explored.
Does it use a battery?
Yes - Japanese quartz movement, battery included. Ready to wear on arrival. Battery replacement is straightforward and infrequent. Quartz accuracy means the time set on delivery remains correct for months without adjustment.
Two Faces. One Watch. Rectangular. Sapphire.
Tank Reverso - 24.5x40mm reversible double-face rectangular, Japan quartz, sapphire crystal, 316L stainless steel, leather strap, 5 ATM / 50M, 1-year Wclocks warranty. White-Black, Black-Turquoise, White-Pearl.
