Very rare watches here as those two different Models were never made as replicas. A gen. 1630 , less than 1000 pieces produced, was the test for the following oysterquartz, the right one. The oysterquarzt was the first Rolex with sapphire crystal, and, as i remember, the first COSC spec Rolex. It is about 50 Years old and till nowdays the most accurate Rolex ever made. Heard from people buying it new with the lithium battery and not having to correct time setting for 10 years. It is a little bit of sarcasm to me posting them here on a rep. Forum, as I boughts them many years ago for the reason that those were never made as reps, I wanted Rolex watches which everyone would without any doubt recognise as genuine.