Chuck, Parker hammer gun #15901, #2 frame 10ga, measures 2 3/8 across the bolsters.
#17895, #3 frame 10ga measures 2 1/2 across the bolsters.
# 9848 #2 frame 10ga measures 2 3/8 across the bolsters.
17895 might be in your book. I think your conclusion is correct, indicates frame size.
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 "Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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