I hope this is not a silly question but I'd like to identify what tool(s) I might need to open this type of screw back watch case (see pic. below). This is an inexpensive Victorinox Swiss Army watch and I really don't want to spend $20-$25 at a Jeweler's to have the battery replaced. I know it's definitely not a snap/pop off case.
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.