You should look for comps using the reference number first, since they are most likely to be very close matches. For the 135.011, there must be many on the OF private sales forum alone.
For the 2761, you may want to expand your search to other similar watches from the same era, just focus on SS cases, Seamaster references, manual-winding. But honestly, that one won't sell for much because of the condition.
All in all, I think you will do fine putting them both up for auction on eBay.
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