Does anyone know this “DTM” logo?

[outofbounds]

Looks like DTM inside an octagon within a circle? Quick look at AA and the sticky here provides no immediate clues.

 

[four.cycle]

Detroit / Detroit Tool & Mfg. Co., 1660 Beard, Detroit, MI / https://www.garagejournal.com/forum/threads/detroit-tool-manufacturing-company.491885/ / http://alloy-artifacts.org/other-makers-p2.html#detroit-tool /

 

[outofbounds]

Thanks 4C for that insight. Being from Detroit I’m inclined to swing by there (by day).