Looking for resources to value my restored 1957 Seamaster Automatic Cal. 501

Greetings everyone!

My father passed away last year and while I was cleaning out his home, I found his old 1957 Omega Seamaster Automatic Caliber 501. It was in HORRIBLE condition and I took it to my local Omega dealer to have it examined and see what it would cost to fully restore it. After 4 months and a trip to/from Switzerland, it has returned. It looks amazing now. My question is: can anyone steer me towards any resources to properly appraise this watch?

I really want to figure out a ballpark value on this watch so I can add it to my insurance policy just in case anything should ever happen to it. This was a gift from my grandmother to my father when he graduated high school in 1958. I intend to keep it as a family heirloom and hand it down to my older son when he's ready someday.

I did take a couple of quick pictures when I dropped it off for repair. The pics are a bit out of focus as it was spur of the moment, but you can see how terrible the watch was before.

I have seen similar on ebay. You may want to check the completed listings for that model.

Too bad you didn't ask before you sent it to Omega to be refurbished. To a lot of collectors, it was beautiful before.

looks great