I am new here, just want to share my movement swap on my SNZG.
I have a SNZG17J1 with 7S36B, last year I smashed the crystal in the bathroom. While repairing it I messed up the hairspring as well making the watch useless.
This year I bought a NH36A, and trying to give my SNZG a new heart and let it beat again.
What I planned to do is to swap in the NH36A with date and day wheel of 7S36B installed, because I wanted to maintain a stealthy look of the SNZG.
Both movements are 3:00 movement and should be a easy operation.
Thanks to Nicholas Hacko’s repair guide I disassembled both movement without much problem.
I put on the 7S36B’s date and day wheel, they both worked well until I put on the original dial and found the date wheel is misaligned (the day wheel is fine and aligned perfectly).
After a closer look at the printed numbers and the tooth, I found that the positions of these 2 date wheels are different.
I tried to swap the date jumper as well, but the positioning pin and screw hole of 7S36B and NH36A is different. (But I guess a 7SX6C’s may work)
I also thought of file down the date jumper a bit to make it work, but I’m not confident enough to do that. I was afraid I would ruin this new movement again. So I decided to live with the white/white day and date wheel setup.
However, after seeing the newer Seiko military series SRP275, I found that looks ok to have a black day wheel and a white date wheel.
And here's the watch after assembly.