Great looking Altimatic diver, marked water resistant, runs well with 36+ hours reserve. Service history unknown and I could not remove the back for an interior shot. Very nice patina, slightly brass- or gold-toned hands, red numeral date wheel, super clean smooth-turning bidirectional bezel. Non-quickset date. Manual winding is a slightly stiff but the watch keeps very good time and undoubtedly would benefit from service. 36mm w/o crown, 20mm lug width. Classic diver, very clean, on a nice Barton tan strap.