Hello, I have just joined the forum. My name is Deborah Bell and I run a mechanical watch and clock museum with my mother, in Haltwhistle Northumberland- 'Mr George's Museum of Time'. The museum is based around a series of children's stories which my mum wrote about her father who was a watch and clock repairer in Northumberland- the 'Mr George the clockman stories'. My mum became a repairer herself and has a huge collection of watches, clocks, tools and parts so we decided to bring everything together so children could learn all about mechanical "proper" time and Mr George, and adults could look at the collection and reminisce. She still repairs both watches and clocks now and has her workshop on our museum premises!
Not an easy one, this and its sister version 7548 was used on diver's, these are both actively sought as donors. You may have better luck looking for a Pulsar Y513. Just for reference attached the service guide. Good luck.
Seiko 7546A - Technical Guide.pdf
I should have mentioned I will not get the stem from Europe, but am simply trying to get the right size. In fact, I may have one in my junk box. Yep, it's a Dollar watch and I'll do all that's necessary before investing money.