If you type Omega 511.0375 into Google and then look at all of the images similar to your watch, then follow the links to auctions, sales etc you will get an idea of what is being asked, but not always attained.
While there may not be a huge collector market chasing your watch, it will appeal to somebody who just likes the look of it.
A sale on eBay will find the true value if the watch and history is described properly and good photographs are provided.
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