www.925-1000.com

I think also, it might be GX instead of GY.

Hello Peter and thanks for welcoming,

Yeah, it's 99% Hungarian. There is also a similar case here https://watchspace.co.uk/2015/03/04/international-watch-detective

Reagarding the probe I was wrong a bit: it's something in between 14K and 18K, but not pure 18K. So, 14K mark is correct here.

But ...

Help to identify IWC wrist watch case manufacturer

Hello dear community,

I have an IWC wristwatch from probably 30th, but can't identify the case manufacturer.

You can see all the marks: hallmark - wolf's head turned to the left with the number 4 next to it, maker's mark - capital letters GY ...