The title rules are there to prevent the listing of a large number of identical items. It is particularly important in the case of items like stamps. It is very offputting for a potential customer to have to wade through a dozen or more stamps of the same issue which only differ in, perhaps, a postmark (ie having the same catalogue number). You could make each title different by numbering it (eg #1,#2) but I would strictly limit the number of times you do that to avoid putting off buyers and because you may incur the wrath of eBid management. If you like you could look at my listings. You will see examples of my solution if you sort the listings into title order.