Mechanical ZIM 2602 movement with 15 ruby jewels. Manual winding. Side second hand. Organic glass. Stainless steel back. Size: diameter is 32 mm, thickness is 10 mm. Serial number of the movement is # 76406. The watch comes with new leather strap(16 mm). Made in USSR by ZIM (Maslennikower Watch Factory) in 1957 (as indicated on the movement). Full tested and regulated. It runs perfect and keeps correct time. The real piece of Soviet History! Extremely rare!