I picked up this Marvin off eBay long ago so I don't even know what I paid for it as it is has been in my collection. It's in fine shape and has a serial on the back of the case.
I haven't opened it, and likely won't as I'll leave that to my buddy who is a watchmaker. It keeps great time - I wore it for a few days last week.
Anyone seen anything like this? I don't come across too many Marvins.