Hi Avery, I wouldn't put anything on an outside finish. You don't want to "upset" the piano faculty or department chair who spent alot for these new pianos. I would put the tags on the backs of uprights, under the keybeds, or someplaces where they don't show. If the inventory dept. complains you didn't do it right, remember they don't have any say about your job. They can do it if they must and also take the heat for it . -Mike Jorgensen
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