My dad got this, when he was back at NYU, teaching airplane engine mechanics: that would have been about 1943.
On to eBay it goes!
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I don’t fancy your chances of getting that into the front pulley of a saloon 
You use the outside wheel, on the generator, do a little measuring, do a little math…
You don’t have any kids or relations that it should go to?
Nope: only child, no kids, and my brother is doing the same thing!
If it turns out to have little value, maybe a Lister would find value in it!
Thanks for doing the research I hadnt yet had time to do: ‘bout what I expected.
Hey…it’s $30!!!
Any of youse yobbos want it?
And have your dad’s and mine’s?
If you happen to run across an Avometer, otoh…
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Actually, I’ve got one.
What I’d really like is a set of original leads.
No idea but it’s cool and i just bought it on Ebay. I need a shipping cost though.
I’ve got an older one that I finally used in anger for the first time a week ago.
I have just converted a perfect lookalike D-type RC167 tach. I couldn’t fault the appearance but it would have been an obvious fake any time the engine was running until I converted it from smooth drag cup operation to jerky old-school original chronometric action.
I used the guts of an old Smiths motorcycle chronometric tach, which I checked using a drill that had in turn been calibrated with a hand-held instrument similar to yours. Beautiful object, heavy in the hand.
Um…yer welcome!! 
