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Thanks for the correction and update Researcher, that is a new one for me.

It's an early Model 11. The buttstock is unusual being straight grip, I've not seen that version.

There is a Model 1100 but it is a much newer model that the pictured.

Welcome aboard SC64, glad to have you on the forum.

I don't know the year but it is much newer than 1964, it does look like a Remington product.

There should be a small gap between the front of the buttstock and the receiver. The older Remingtons used a Stock Bearing Plate(SBP) to create this gap, the gap prevents chipping of wood during recoil ...

Welcome to the forum arlon, glad to have you aboard.

Add some models and calibers and any other info that might help people answer your query.

Welcome to the forum DaveinNH, glad to have you aboard.

Some of the Nylon stocks, any model, can split along the seam. I would inspect the lengths of the seams for any separation.

If the spring still has strength then the damage may be cosmetic. If the spring is dead then any heat treat is probably lost, this could make it unsafe.

It does not sound familiar to me, pics might help with identifcation.

If the butt is flat then a recoil pad may have been added in the past, what you call "original plate" might be the remnants of the hard portion of the recoil pad after the soft portion has been removed.

I would be tempted to put a Pachmayr RP200 recoil pad on it instead of a plate. Pachmayr makes ...

I'm drawing a blank on those dims. I may have a couple books that will help if I can locate them. If the gun can be identified that will help. If the barrel has been changed or set back then it's a possibility that the cartridge is a wildcat.

The chamber cast looks pretty good. A little less ...

Nice looking rifle, very clean for a rifle of that age.

Just a guess, a limited run for one of the wholesalers. It's not unusual for Remington to make a special run for a wholesaler, that wholesaler will offer it to their dealers, the those dealers offer it to their customers so that the buyer will have something that not everyone else has. This is ...

Model 32, I think, but I'm not all that familiar with Remington O/U's,