I own this exact watch, and it's a true "sleeper" I have lots of very nice high-grade watches, but I love wearing this. BTW, it keeps perfect time - which (I know) is not always the case with Seiko's entry level movements.
To be clear, Rolex never used the 7750 in their Daytonas. They used their modified version of the Valjoux 72. The 7750 was used in some Tudor chronographs, but never Rolex. Also, the 6138's are amazing watches! I own this exact model, and another version ("the Jumbo") as well.
Shant's Watch and Clock repair in Pasadena is very good. Shant is a third generation watchmaker and is quite skilled with vintage pieces. Also he's a relatively younger guy which, for watchmakers these days, is unusual. I've had very good luck with him.
I don't really understand the objection (by many ) to the 4:30 date window with many of the el Primero watches. It has never bothered me.....but I appear to be in the minority!
I am a huge fan of the Zenith watches from this era. I own quite a few of them. They can still be bought at relatively very good prices compared to other brands that have used the El Priimero. Don't forget several top watch makers used this movement: Daniel Roth, Rolex, Urban Jurgensen, Parmigiani t
Actually the Sea-Gull version of the ETA 6497 is generally just fine. Certainly not distinguished, but they work well. The biggest problem with some of the Chinese movements is QC - which is spotty, but has been getting better of late. And if it's truly a Sea-Gull movement (some are made by others a