Go onto eBay, put 'Omega 354' or 'Omega Bumper' in the search engine. When you get the results, click on 'completed listings'. You will then see what similar watches have sold for in auction or buy it now.
As
@X350 XJR said, don’t polish, don’t change anything, don’t put another strap on, just add about a dozen photos.
Any serious buyers will know about the movement and dimensions. Your photos will show the condition.
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