Guinand is a storied watch house, yet its greatest stake on historical significance is its long-standing relationship with the late Helmut Sinn. Mr. Sinn bought the company in 1995 after finding retirement unbearable, but this fruitful relationship first started in the early 1960s when Sinn contracted Guinand to manufacture a version of their Model 361 as the Sinn 102b. As such, the Guinand Model 361 reissue commemorates the genesis of Sinn’s ultra-tough and well-priced tool watches that so many of us watch-heads enjoy today. Both the original and the modern 361 boast 200 meters of water resistance, 11. 000 meters of altitude capability, no date, a dual-direction rotating bezel, a two-register chronograph laid out on a glossy black panda dial, and a mirror-polished case that’s essential to the 1960s aesthetic. The case measures 40.6 millimeters across, 15.2 thick, and just 48.4 from lug-to-lug; this sizing is nearly identical to many of Sinn’s most memorable pilot watches.