thats just a no 2 with a long frame.
you used to be able to order them, dont know if they still make em.
Its that long so you can use larger radius dies- but, mostly for thin wall stuff- doesnt mean you can hand bend 4" schedule 40 or anything like that.
I would agree, call up hossfeld, they can explain why it was built like that, and what dies it was made to fit.