Dave, Dean and Bill clarified that in earlier posts. Charts on page 45 in the Serialization Book and page 527 in The Parker Story correlates the inches width of bolsters to frame size. The 2 1/2 at the factory was a #3 frame stamped on the gun, and so on. Brian, it makes sense if we realize that the later books use the sizes actually stamped on the gun and the earlier books identify frames in inches and fractions of inches.
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