How to identify a Graham tonearm


I got a Graham tonearm installed on a Basis turntable yesterday in a trade. Having not had one before I'd like to know if there is an easy way to distinguish between the 1.5, 2 and 2.2 versions. Thanks for your reply.
rloggie
I got one recently, 1.5 upgraded to 2.2 at factory and Basis 2001. This is a very good combination. I am using an AT 33 EV but I would think a very wide range of cartridges would work. I talked to A.J. recently and he told me he had a personal preference for the older Graham arms over the Phantom. The clamp is worthwhile if yours came without one as mine did; I recently found a used one.