Croton Computer Swiss Valjoux chronograph 

This is a vintage 1960's Swiss chrono by Croton (founded 1878).  It is in full working condition, and keeping good time. 

36mm case with 18mm lugs, set on a brown two-piece leather strap. 

Powered by a Valjoux 7733 manual-wind mechanical chronograph movement.  Chronograph tracks seconds and minutes. 

12-hour dial with baton indices.  Inner bezel includes tachymeter.  Dial marked "T Swiss T".  Subdials for seconds and chrono minutes. 

Excellent condition.