Universal Geneve 842139 – Crown Help

I am an owner of this watch below, UG Tank Ref. 842139. I have been on the hunt for awhile however to no avail, so I was wondering if anyone knows where or what other references I could find and source an original crown for it as this reference is not the cheapest to buy again?

This is my first post, though being on here for 2 years reading all the great posts! Please don't attack me below in the reply's 😂

Thanks,
Piro