Assuming the parts are original is should be a Super 44. The D-44 had a stamped steel air filter cover like the 77, and the Super 44A versions had an extra grill (hockey mask) over the flywheel screen. It could also be a 1-70.
The model number will be stamped on the bottom of the crankcase. This one happens to be a Super 44A, the 55 is XX'd out and the A is trailing. A Super 44 should have an S44 stamped on the bottom, probably with the 55 XX's out like this one.
Mark
The model number will be stamped on the bottom of the crankcase. This one happens to be a Super 44A, the 55 is XX'd out and the A is trailing. A Super 44 should have an S44 stamped on the bottom, probably with the 55 XX's out like this one.
Mark