Hi Karen: If you are a guild member, why don't you ask around at your next meeting. Piano techs, like myself who have done a number of key recoverings usually have amassed a collection of old ivory keytops for use in situations just the one you are in. Ask if you can borrow a bucket of old ivories and just match them the best you can to the piano. Sometimes you may have to file the edges of the ivory a little to fit the key. I definately recommend removing the old glue from the key and ivory before gluing the replacement one on. I don't know if keytop dimensions are on-file for 100 year old pianos and I suggest that trying to find the "correct" ivories that way won't get you very far. Good Luck, Matt
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