The ones that Bauska handled would be so marked. Not to say it could no, but if it originated from overseas, probably not. Remember the pre-CZ company was very willing to do "custom" work as well. I no longer own it (sadly) but had a post-64 M-70 winchester that came from Uganda. Sometime in its life it was sent to BRNO and rebarreled with a fine podi steel barrel in their contour and length. Intergral sight base, banded front site, all of it.

As to the set trigger there was a seller on GB in Fountain Valley Ca. under the name of ZDENO who had a bunch of NOS parts.

Do whatever you like to the stock. They have no real collector value.