In the 60s, dive watches were often in the 36-38mm range. To honor this, I designed a case matching the 36mm Sheffield Divers' proportions, without a crown guard and with appropriately scaled lugs. The Seiko NH35 movement keeps the thickness slightly less than the 1A 40mm, ensuring it fits well under a cuffed shirt.

The bezel is non-luminous like the originals, and the dials, especially the 1A and 1A Black/Blue, are very faithful. The Silver Dial model features round markers for brighter lume. These watches have coated sapphire crystals, period-correct Tropic straps, and a 200-meter water resistance.