Can anyone Help me identify this 4.5 crank ???

'73red-duster said
I came up with a 6.6 liter Duramax diesel.

Lol, I got that also when I searched.
It’s a 4.5 stroke RB crank, I’m guessing it’s at least 10-15, 20 yrs old. Not that it really matters but I’d like to know what brand it is.