Originally Posted by gregjones

Send a message to the seller and ask for close-up, detailed pictures of the back of the crank arm and see what's stamped there.

The RD2 is close to, if not the same, as the Messenger cranks. Unless you have a problem crunching up chainrings with your excessive leg power the provided chainring should work. Anyway the price is in line for RD2 crank arms without a chainring.