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Rado True Square Open Heart Unisex Watch
Ref. R27086162
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Stepping up in the same dial colour
The True Square began as Rado's demonstration of what ceramic could do that metal cannot: a square monobloc case formed in a single injection, no joints, no inserts, no concessions to the difficulty of the shape. The result is a case that is genuinely light for its presence on the wrist — 120 grams across the whole watch, bracelet included, which for a full ceramic construction reads as a surprise the first time you pick it up. The open-heart dial earns its place here because the movement is worth seeing. The R734 runs a Nivachron hairspring, which resists magnetic fields without a Faraday cage, and is rated to 80 hours of reserve — tested across five positions, not just the one that flatters. Through the sapphire caseback window the same picture repeats from the other side. The square case keeps the dial geometry strict, and the black-on-black palette means the skeleton work reads as depth rather than decoration, shifting with the light rather than announcing itself. The clasp is titanium against the ceramic bracelet — a practical choice, since the adjustment mechanism benefits from metal, and titanium keeps the overall weight honest.
- Reference
- R27086162
- Brand
- Rado
- Collection
- True
- Case size
- 38mm
- Case thickness
- 9.7mm
- Case material
- Ceramic
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- R734
- Functions
- Skeleton dial
- Water resistance
- 50m
- Bracelet / strap
- Ceramic bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- Super-LumiNova
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 80 hours
Learn more about Rado
Rado began as Schlup & Co, a movement manufacturer founded by the Schlup brothers in Lengnau in 1917. It became one of the largest movement producers in the world before releasing watches under the Rado name in 1957.
The brand's entire identity rests on a single question: how do you stop a watch from looking worn? The DiaStar of 1962 was marketed as the world's first scratchproof watch, using hardmetal — tungsten carbide — and a sapphire crystal at a time when both were exotic in watchmaking.
Rado then spent decades pushing further into materials most watchmakers avoided because they are difficult to machine and impossible to correct. High-tech ceramic arrived in 1986 with the Integral, and the Ceramica of 1990 was made almost entirely from it. The company developed plasma high-tech ceramic, which is heated to 20,000 degrees to acquire a metallic sheen without any metal content, and Ceramos, a ceramic-metal composite.
The V10K of 2002 used high-tech diamond and reached 10,000 on the Vickers scale — the hardness of diamond itself, and a Guinness record.
Rado's design language is correspondingly clean and monolithic, with the True and Captain Cook lines carrying the modern collection. The company has been part of the Swatch Group since 1983.
- 1917
- Founded as Schlup & Co in Lengnau.
- 1957
- The first watches carry the Rado name.
- 1962
- The DiaStar introduces a scratchproof hardmetal case.
- 1986
- High-tech ceramic enters production.
- 2002
- The V10K reaches diamond-level surface hardness.
Also in 5 collections
This watch appears in the Rado True range (9), Back in Stock (3,460), Automatic Watches (1,573), Skeleton Watches (248) and Ceramic Watches (98).
Temporarily out of stock
Mappin & Webb is not currently taking orders for this reference. Last listed as available on 27 September 2026. Stock is checked nightly and this page updates when it returns.
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 38mm suits most wrists
- Sapphire crystal, which resists scratching
- 80-hour reserve survives a weekend off the wrist
- Luminous hands and markers for low light
Worth knowing
- 50m suits rain and handwashing, not swimming
Rado True Square Open Heart alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | R27086162 | 01 403 7776 4065-07 5 19 11 | L16494722 |
|---|---|---|---|
| Price | £2,450 | £2,440 | £2,650 |
| Case size | 38mm | 38mm | 38mm |
| Water resistance | 50m | 50m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Ceramic bracelet | Leather strap | Leather strap |
| Power reserve | 80 hours | 120 hours | 72 hours |
| This watch | Closely matched | Closely matched |
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Showering yes, swimming no. 50m covers splashes and brief immersion, but a swimming stroke generates well above the pressure that figure describes.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 80 hours fully wound — enough to sit off the wrist over a weekend and still be running.
Is it a men's or women's watch?
Listed as unisex, and at this size it suits any wrist that takes the dimensions.
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