Omega

Silver dial silver indices with tritium lume plots Mvmnt. cal 611 hand winding center second and calendar (date) display which is in the 21 million serial number range Case ref.# 138.011 in stainless Steel Lug width: 18MM Circa: 1964 misc: OMEGA Crystal p...  

Chart: ...  

Small, simple and understated but executed just perfectly - my kind of watch!😎

. . . as the handful I've had direct experience with have all been superlative performers. Mine measured +/- 0 (yes, you read that right!) seconds per day when I got it many years ago. Here's a photo of a cal 602 . . . . . . that might've been taken by Bi...  

was introduced in the 1960's, are the only movement that OMEGA made internally with no out sourced parts. They are so well made that any competent watch maker can calibrate them to perform to modern day chronometer standards