It's a 1 1/2 frame gun. Parker changed from a horizontal type entry to a vertical entry of serial numbers in the stock books starting in 1929. In this new style, the frame size is listed where it wasn't listed in the horizontal style stock books. There are a lot of 1/2 frame sizes listed, no 1 1/2 frames are found. These frame size were hand written until the last 2 stocks book # 81 & 82 when they used stamps instead of hand written frame sizes. In these last 2 books, frame size 1 1/2 is seen. I guess the guy was just too lazy to write 1 1/2.
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