[QUOTE=Dean Romig;405491]But the exact measurement between the centers of the firing pin noses is……??



Here is a pic

1 1/8” could be either a 1 1/2 frame or a 2 frame but with the total weight of the gun I believe it is a 1 1/2 frame.





.

It measures 2 1/4” across the bolsters

So that confirms it being a 1 1/2 frame.





.

Any thoughts on why the frame size is not stamped on the lug?

A simple oversight I would think.





.

Just a reminder. You shouldn't use a hook end on a tape measure to make a measurement this precise. The method you used in the first picture is the prefered method. This was discussed in a similar thread not long ago.

[QUOTE=Arthur Shaffer;405528]Just a reminder. You shouldn't use a hook end on a tape measure to make a measurement this precise. The method you used in the first picture is the prefered method. This was discussed in a similar thread not long ago.[/QUOTE

Is this better?

Yes it is always better to use a precision instrument.





.

Y'all never heard of a simple vernier caliper? More accurate than a yardstick and easier to understand than a battery operated instrument. Also real cheap on the internet.