I wouldn't be surprised if it was a Keystone replacement stock too. But as you say Jim, very pretty rifle, I would certainly give her gun safe room.
I suspect the stock is a prewar Springfield, there is also a repair ahead of the bolt handle where it looks to have had a Lyman 48 at one time. Is there an "S" stamped in the mag disconnect relief? Anyhow, I'd buy it too, nothing to scoff at.