The question was, was it a One and a Half frame, or, a Two Frame. Since the table says the two frames sizes are both 1 1/8" firing pin spacing, measuring the pin spacing alone will not answer the question. The width across the bolsters, and the height of the standing breech are the two measurements needed to determine the frame size, but NOT the firing pin spacing.
So, back to my original question; Is the information in the serialization book incorrect?

Excapt for the engraving, this is what an original doll's head rib extension would have looked like.

The second one is on the subject gun - compare the two to see the differences.


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We would like to see the wood to see how many of the VH parts made it onto the DH frame.

This really isn't accurate. At best, it may have been true, pre 1900, but with the addition of the 1 1/2 frame size, which fell in between the existing One, and Two frames, the firing pin spacing is the same as the Two Frame.
Again, in 1928, with the addition of the Half Frame, which at least numerically fell in between the 0 frame, and 1 frame, the firing pin spacing is is 1 1/16", the same as the One frame.
Since the question remains unanswered as to whether the subject gun in the original post was a 2 Frame, or a 1 1/2 Frame, using the firing pin spacing and the tables, the question remains a question, because regardless, the firing pin spacing, Horizontally, is still 1 1/8".
Because the standing breech dimension between 1 1/2 and 2 differs, the firing pins may be striking slightly off center, in the Vertical plane.
So, using the firing pin spacing alone may get you to the right neighborhood, it might not get you to the right house.