The "Standard" frame size for the 12g. was the 2 frame when things started out. It came to be 1-1/2 later on.
Generally speaking, standard frame sizes are:
20g. - 0
16g. - 1
12g. - 2
10g. - 3
Then if a lighter or heavier gun was needed within a given gauge, the frame size could be altered depending on needs.
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B. Dudley
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