Hope you get a good price for your collection. Can you give any more details of the type of stamps you have. Where you bought them from and what...
Check with someone knowledgeable to see if it is genuine or not. It looks like a good collection to me. Interesting design. I like all the stamp...
I good age is about 9 or 10 by that age there mature enough to appreciate the collection but not too old that they become bored with it or its not...
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