I've got an American Bosch mag from a 40's era Waukesha power unit with a similar "window" on one side of the cap.
Directly behind the window is the rotor drive gear. One rotor gear tooth is painted white. When the mag is at TDC #1, the white tooth is centered in the window.
This feature simplifies timing the mag to the engine - no messing with the impulse coupling is required. With the engine at TDC #1 cyl firing, simply rotate the coupling backward until the white tooth appears, then mount the mag.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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