I found an authentic Polish Honor Guard rifle, aka SKS-M (modified) on Facebook, that is owned by a person in Poland. Here's some information he provided:
Owner: Marcin from Warsaw, Poland, 2018 post.
“In the picture is my fresh recently purchased SKS made in Tula, USSR in 1953. Originally modified for Representative Battalion of the Polish Army (Honor Guard Battalion). The original Polish name is SKS –M (modified). The original stock is replaced by beech plywood. Bayonet and bolt are polished and finished with nickel as well as the butt plate. This rifle is still in service in some Honor Guard Units in Poland – however they are being displaced by new introduced Polish MSBS vel “Grot” (Modular Small Arms System, aka “Arrowhead”)”.
2022 comment: “We have auctions organized in Poland by the Military Property Agency, https://amw.com.pl/en If you have a license you can go and buy old but still nice equipment from rifles, to helis, tanks and old, not planned for future use, weapons. Some of the goods like pistols, ammo or rifles etc. can then be sold on the civilian market. The SKS is not the most popular in Poland but IMHO the SKS has "soul". Still, in Poland the most popular are AK clones and now AR15 type rifles. Mine is strictly a "collection one" and rarely used on the shooting range. But this is one of the prettiest ones I have.”He only shared one picture. I thought it was interesting that it's a 1953 Tula. Internet hearsay from an old Gunboards post and Wikipedia is that the Poles received/purchased 1954 SKS-45s, some say only Tulas, and some say purchased them in 1954. The purchased in 1954 scenario, where the purchases included old inventory, not just new production, is the only plausibly true scenario from those choices, given this data point on a purported 1953 Tula.