I am not a watch expert, but do know that selling scrap gold is one of the more challenging things you can attempt on eBay. The Omega looks pretty worn (out) to me - have no idea what the possible gold scrap value would be but I don't think it would be very much. The no-name watch is not likely to be worth much as a watch - the plated watch band will have some small gold value - 20 microns is a gold solid plating. The rolled gold watch and band will have even less gold value - depending on the condition it may have some value as a watch but only if it is in good condition and runs well. The gold plate may be worn - I can't tell from the photo. If you do want to sell them as scrap value, be sure to put SCRAP ONLY in the title, and don't weigh anything - the weight is irrelevant. Take a good clear photo of any markings that show the gold / plating, give measurements for the faces of the watches, length and width of the bands - and I would definitely sell to Australia only. Someone with more knowledge of watches may come along.