Wow Nice set, You should have little problem selling that. I know a couple of tea cup collectors would open their purse and dump it out for those. One thing to keep in mind about Tea cups. You will make more money selling each cup seperate, from the looks of these, I would say easy $30 for each cup, but as a set you are looking about $100.00 since you still have the box. Most tea cup collectors don't want too many cups that look the same. Looks like you have a set of 6 different colors that is a bonus too. As to where to sell, well Ebay would eat them up but you may get a bit less. Then if you place them in consignment or a Antique mall you may get more. Find yourself a cup Collector and they may even give you more. Is it possible to get pics of the hallmarks this may help in determining history. Good look and they are very nice cups