January 1984 built Zuanshi SM1A-K 152 / Shanghai #4 Wristwatch Factory

151s had a chrome plated case and 152s (like this one) were solid stainless.

聽SM1A-K movements are legendary runners in VCM circles.

Love the logo and hour markers

Looks nice, really need a bath. Your boy's grimy. 馃槢

Runs away!