Identification of degree indicator

[sgs236]

These degree face plate indicators where in a box lot I picked up at a recent auction and I'm not having any success at identifying what equipment used them. Face plates are 6" diameter.

I can make out ACKERMAN BODN---Something
Stock NO. 61D4CC
On the back side, 10/76 (Likely the year made)
ABC
61D-4-CC

So far my google skills are coming up short. Thought I would see if anyone here recognizes it.

 

[RTM]

Ackerman Bodner was in business in 1974 in New Rochelle NY is all I can find now, maybe more luck tomorrow, it’s past my bedtime.

 

[larry_g]

https://shop.sdp-si.com/catalog/?brand=sdp&cid=p76

https://shop.sdp-si.com/catalog/?cid=p240

Stock drive parts. You buy the wheel in various sizes and or degree markings to incorporate into what ever your designing. I have a pair in the tool box that I used to use to set up machines. They are fixed to pot magnets and I could stick them on the end of a shaft and set up timing events in the machine.

lg
no neat sig line

 

[nutjob]

I had a degree wheel just like that that was used on a car engine to degree the camshaft. Bolted on the end of the crankshaft and a home made pointer. You can google how to degree a camshaft to see this in use. I think ours were Moroso brand.

Kevin