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20 Degree Pressure Angle
The gear on that motor is a 20 Degree Pressure Angle gear.
The gear is 12 Tooth, 16 Diametral Pitch, Stub, 20 Degree Pressure Angle,
The gear is a "Stub" tooth gear, but it can mate okay with a full depth gear if you increase the center distance a bit from the theoretical number. Another option is to put shave the OD of the standard gear by .4"/DP, which in this case is .4/20 or .020"
If you are making your own gear, then of course, just make the gear a stub gear to begin with -- (.8/DP for the addendum, 1/DP for the dedendum).
Good Luck.
Joe J.
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