Cosmic Yellow...

Welcome to the forum!

I’m no expert, but this looks like a redial to me, on the basis that the Seamaster script is off and the lettering on Cosmic also doesn’t look right either. I’ve also not seen a dial this lurid on a Cosmic. But it looks like a fun watch to wear. I’d put it on a black NATO with a central yellow stripe, or similar. A black leather strap would work well, too, but I might be tempted to go with navy blue just to be a little different. There are plenty of threads here where you can see what is around - try the WRUW (What are You Wearing) thread for starters.

If you haven’t got proof of service history, I would recommend having an independent watchmaker look it over and give it a service. If it hasn’t been done for a while, then the oils around the parts can dry up and cause issues. Freshly serviced it will last a good few years of no-hassle running. Depending on where you are, factor in a couple of hundred of your local currency for this. Once serviced, wear it and enjoy it! The movements in these are good workhorses and it will be a reliable daily wearer.

I believe these would have come on a leather strap originally.

if you are looking to add to your collection, posting the watch on here first will help to answer some of your questions before purchase. I don’t know what you paid, but there are good, all-original Cosmics to be had out there still quite reasonably. But, of course, it all depends on what you’re looking for. Bottom line: if you like it, wear it!

Here’s a Cosmic I used to own for comparison on the scripts:



Like I said, I'm no expert, but I’m sure there will be others on here who can confirm. Yours is a redial for me.