NOS, This mechanical recording tachometer FAA-TSO is a high-quality part from Mitchell Aircraft Products. manufacturer part number of D1-112-5025, The tach/rpm works just fine when tested, but the hour meter (tach time) doesn't turn, it stays on at about 0000.7 hrs. 
Made in the United States. and is being sold for parts/repair.

Please see pictures as they provide the most accurate description.

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