Does the new MPS-1A set-up come with the orange GWS 5-4.3 prop?

From : Don Stackhouse

Yes, the easiest way to tell the -1A from the old -1 is that the new one uses the orange GWS 5-4.3 prop (the old -1 used the white Gunther prop). The other easy way to tell is that the -1A uses two identical white plastic frames to hold the motor by the outside of the can at both ends. The old -1 used a front frame with a small hole that just held the bushing around the shaft at the front of the motor, not the outside of the can. There are a bunch of other little detail changes (the only parts common between the -1 and the -1A are the motor and the pinion gear), but those are probably the most obvious.

Don Stackhouse
DJ Aerotech