Vintage '72 Seiko 7006-7089 Rally Watch, Vibrant Blue, Orig. Band, Runs Slow

Details:

Up for sale is a vintage Seiko model 7006-7089 watch, running with all functions working but running very slow. The serial number dates it to July of 1972. The design of this model is very of its era, with a vibrant blue dial and dramatic chapter ring. Mechanically, even though this runs and the date functions properly (including via the quickset), it is losing several minutes an hour. I don't think that's within the range of regulation and would assume it needs service or some repair to be a da...