This is a vintage Stewart Warner Speedometer that appears to be rebuilt. I have nothing to test it on, but it seems functional and in very nice condition. I found it in a copy of a 1927 catalog and it is listed as a “speedometer for cars other than Fords.” I have included an scan of that page from the catalog. It measures 3-1/8” in diameter and is about 2-3/4” deep. The resetting of the trip odometer works fine and the drum seems free and moves about easily. I have attached several photos for you to examine.  

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Please contact me if you have any specific questions about this item. Check out my other auctions for additional automobile and petroleum related collectibles. My eBay store is called “Vintage Maps and More” and I have been buying and selling on eBay since 1996.