Rotary Henley Pilot - GB05235/04. 42mm Stainless Steel case with scratch-resistant sapphire glass. The black dial features two sub dials and a counter sunk date window, additionally displaying a sliding clasp. With reference points in red on both the inner and outer scales, the sliding rule can be used to perform simple mathematical calculations including petrol consumption and miles per minute. The circular slide rule features a mobile bidirectional bezel and second fixed scale on the dial. Stainless Steel mesh bracelet. In excellent condition. Will fit a 22cm wrist. Also as stated that it is naked and will need a battery hence the price as I’m pretty sure they don’t make these anymore.