In 10-20 years time you'll be lucky to get a tenner for it and i'm being deadly serious here.
There is absolutely nothing special about Gamages watches that are going to increase their value or be worth a collector of older watches being interested in it in the future.
They are just cheap generic Chinese watches, produced for these recently formed shyster brands trying to make a quick killing by taking advantage of the resurgence in interest in watch collecting from uninformed buyers.
At least when you buy them direct from China, they charge you the true value, unlike the low life scum businessmen (actually they don't deserve to be called that, con artists is more appropriate) in this country and West in general, that are just out to rip off customers.