SBM Crank Identification Help!

Thanks for all the help.
I guess there is no listing that would reference a number to application.
My Galen white books don't have crank numbers.
I have figured out that the cranks with no holes through the rod journals are 273 or 318, one pre 68 and one post.
The one I am going to use is the one pishta said was a 340 crank.
It has the large register and the double roller gear.
No number stamped anywhere.
I know the gear doesn't mean anything, but I have had these for years.
Not sure where I got it from.
It needs some work, but should be ok for what I want to do.340 Crank.JPG