Nice old 16's.
in pic #7 it looks like the butt stock on that model 12 had been professionally bent. Are my eyes deceiving me?
I see what you are talking about. Very possible it has had some cast-off for a right handed shooter put in.
It's easy to accomplish in the M12. No bending of the wood as with SxS's.
The stock attaches by way of a through bolt to a short tang that is screwed on the back of the frame.
That short tang can be bent. That bend (up/down,,L/R) will move the butt stock in the direction when re-attached by it's through bolt.
It doesn't take much change in the direction of that short tang to make a big difference at the butt end, so it takes some experience and usually a couple tries at it to get it right.
They can be bent 'cold' but I do them heated just to red w/a OA torch. They bend easily that way.
When correct, you then have to re-inlet the head of the stock back to the rear of the frame as the stock has changed angle of approach to the frame slightly. Not a lot of work and the shuffle guns and semi autos are easy to work over.
Most of the requests, if you get them at all anymore for this type of work, are for reducing the 'drop' on older guns which can be excessive in terms of what most shooters expect to deal with these days.
This will change the Pitch as you correct the drop this way.
But most are delighted to have the excessive drop gone and the slightly different pitch doesn't seem to be a big deal.
But it can also be corrected if needed.
Nice classic pair of pump guns.
First pump gun I ever had was a field grade Ithaca 37 16g