Dating and identification of my vintage omega

Greetings,
Can anyone give me any information on this watch? It’s a front loader I think. I’ve never had it serviced so I have no idea of the caliber or serial numbers. It’s 14k solid gold and weight is 22.9grams, don’t know how much movement and crystal weighs I guessed 10 grams. It runs very well.If case is 14grams Thats $491 by current prices.Yes I am trying to sell it, my dad bought it new. I’ve been offered 600 but thought a running omega in good condition was worth more than $100 over scrap. My dad passed in 1999, I’m sure he’d want someone to have it that’d appreciate it not melt it. Any help would be appreciated. A jeweler said it looked like a 17 jewel 601 caliber because of distinctive lugs. I don’t know what to believe. I took info I had and listed it on eBay for $750 obo. I need help from you pro’s. I’ve never seen a watch this difficult to open, was told I could damage it if I didn’t know what I was doing. The only vintage omega jeweler in my area is currently closed because of pandemic indefinitely, hes In Annapolis. So I took the advice and here we are. I’m going to try to upload pictures now. Thanks for your time.

I appreciate the information and response, and at the same time I’m flabbergasted that a running in above average condition Omega watch is only worth $100 over scrap gold prices. I’ve held onto this watch for 20yrs simply because of what I’ve read about comparisons between Omega and Rolex quality. To say disheartened would be an understatement. The 520 caliber must be a movement less desirable. However it’s very precise after all this time. I now must decide whether to have the interior photographed so I’m sure, and have a new crystal installed or sell as is. Seems an expensive undertaking for a low end watch. Decisions decisions. If anyone is interested in this particular watch let me know. I saw there was another part of the forum for selling. Is that correct? I’d like to thank the pro’s who responded again. Have a great day.

Another option of course, should you decide it’s not worth selling, is to have it serviced and enjoy as a memento from your father.

FWIW the 520 cal is a very pleasing thin manual wind movement - looks like this (perhaps yours might be a bit cleaner). Apparently, some were even "avec bulletin" - that is, tuned up to certified chronometer standards. The lack of collector demand says nothing either way about its quality. No Omega is ever anyone's idea of a "low end watch"!
I had a J6587 just like yours, and I liked it, but (IMO) it just didn't seem like the right style for a man's watch for the 21st century. However... exactly the same shift in tastes since 1958-59 meant that it suited my daughter perfectly - modern women tend not to like vintage women's watches in my experience: they don't want something they can barely see and which was designed as jewellery not timepiece. I guess my point is, you do indeed have a beautiful and desirable watch there, just not one that crusty old collectors want to fight over. Seen in the right light, you have the power to make either yourself or someone else special feel pretty happy with this - just not financially, is all.
Cleaning up the crystal might be easier than you think - I'll leave experts to comment, and sharper photos might be needed - so maybe a new one is not going to be required. All up to you, but you might find the net benefits ($ or otherwise) of sell vs keep are slightly different to the numbers you started with.

I second the responses from the pros above. I just sold a 14 karat solid gold Omega 2445 on eBay for 600 bucks, also 33.5 mm.

Greetings, Doug...I don’t know much about your vintage Omega, but I do see a pretty sweet vintage 1914 D Lincoln cent in your avatar. Is that MS-65 RED? 👍