Well folks, thank you all for your replies and insight. Obviously the consensus is that the rifle is restored, and yall know more than i do.
My hypothesis is that the bolt is good. The SN is stamped on the handle root and the shroud. SN acid etched on the safety flag and extractor (the extractor SN is only visible in the right light, only just found it yesterday). No SN on cocking piece (only E/77). No markings on firing pin.
My belief that the bolt is good stems from a reply by Mrfarb in another thread several years ago. A screenshot of the post is attached. He seems to have stated (paraphrased here) that bolts with stamped and acid etched numbers on later build SSZZA4 rifles are the exception to the rule that they would only have acid-etched parts. Forgive me if my logic is flawed, but his statement seems to imply that stamp/acid bolts on late builds DO exist, even if theyre less common than the purely acid etched.
Plus why would someone just have the correctly acid-etched parts lying around for the rifle but not the bolt body or shroud? Id say it’s unlikely even if used as a sporter.
The stamped SN font on the floor plate and bolt appear to match. Harder to tell with the front barrel band, but to my eyes it looks very similar, just possibly a better strike on the front band. I will be removing the white stuff from the markings when i get home tonight and will redo some pics.
Just so everyone understands, I do realize that this rifle may (likely) be a restored piece. I am happy with the rifle regardless. It feels like butter and has a *fantastic* bore, so if truly a restored piece it will make a great shooter. Since general sample size of these SSZZA4 rifles small, i’ll keep putting my “hypotheses” to the rifle into the thread for the sake of discord and personal learning. I truly appreciate all of you interacting and contributing.