A vintage Rittenhouse door chime can be a bit tricky to find, however if you have one in your possession, then you really have a piece of history with lots of charm. If on the other hand you're looking for an authentic Rittenhouse door bell chime, then you need to check out antique clock shops or stores like Ebay where you can find rare and unusual things that are old and original. You might find a model that looks good, but doesn't work quite right, however that might be able to be fixed, and if you're mostly interested in its historical charm, then it might not matter whether or not it actually is functional. Here is one example of an old model of this brand: 
RITTENHOUSE BRASS DOOR CHIMES - VINTAGE
"This auction is for vintage Rittenhouse door chimes. I think they are from the 50's or 60's. T are two brass chimes that measure about 34" and 38" with the electrical parts and a brown wood-look cover with a harp on it. They came out of an estate w the house was sold. They are in great condition accept for a few wear marks on the brass. Please check out the pictures for detail." available at worthpoint.com Auctions and vintage clock stores are other places where you might find an original Rittenhouse door chime for your home.
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