This appears to be a Hamilton T-28R-2. Note it has no exhaust stacks on the lower left cowling. The T-28R-2 only had a single large exhaust stack on the lower right cowling. There is a porthole type window on both sides of the fuselage for the passenger compartment. This a/c had substantial damage in a crash on 23 August 1995. It currently resides at the Planes of Fame Museum in Chino, CA. in unrestored condition.