Brand: SEIKOMATIC DIASHOCK
SM164 (24/01/21 2130)
Case no: 63xxxxx / 6206-8120
Function: Hour, min & sec hands with day & date
Caliber: 6206
Vibrations per hour: 18,000
Production year: Mar 1966's
Driving system: Automatic winding
Dial: Nice silver color dial original (Some fine scratches & stain)
Dial no: JAPAN 6206-8120T AD
Crystal: Acrylic (Some fine hair scratches)
Case: Stainless steel (Fine scratches & deep dent)
Case back: Stainless steel (Fine scratches)
Dimensions of case: 34 x 41 mm (Excluding crown)
Case lug width: 20mm
Condition: Used, working, very fine in as found condition as you can see at the Picture
Service: Yes
Power reserve: Fully wind or charged will last up to 35 to 40 hour's depend on movement
Accuracy: Tested flat & it's within 60 sec. Please see the last pic
Quick set: Yes, Do not quick set the day or date within 10 to 4 o'clock
Pull out the crown to the first click to set date & pull out the crown to secound click to set time or turn it by 24 hour's to set day (Set the time to 5.30 or 6.30 than quick set the day or date will be better)
Remarks: This watch are used in Japan