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I agree looks better than my first look over, hosed a million acorns and nest off it I’ll post those in  project section. It’s one owner bike made 10/75 he paid 2375 for it parked it in a shed in 2003 and never rode it again.

Although very rough this is a Denco tricone. Notice the likeness of this hanger to yours. 

 

Agree it does appear to be a Denco/HBE two companies had knd of joined together at that point..I have a Denco system on my 650, but it is marked as Denco on the back of the hanger. Yours looks much like the pipe in my  avatar. They worked very well for their time.