When you compare your engine pictures with those that ARNE provided the superstructure matches in all details save the inverted V for key clearance (there is the difference in wheel spoke count and shape between your engine and ARNE's example, however, the Schiffmann reference has a photograph of this engine with wheels that appear to match yours). Based on your third photo the inverted V for clearance of the windup key doesn't look to be symmetric which, given the overall condition and the obvious repainting would argue for a home modification by someone way back when.
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