I’ll defer to Lou Luttrell on the WCA site re: sights. This has long been a slightly contentious issue.
“1952-1953: Both MC and LC FWTs manufactured in 308 WIN chambering only. Sight on both was the Marbles 69 folding (see 1953 catalog reprint page above). Nothing in Rule’s book appears to contradict this.
1954-1957: Win 22K replaced the Marbles 69 for LC stocks. Around this time Lyman 16A replaced the Marbles 69 for MC stocks. Since the other M70 chamberings that were offered with LC stocks came along in 1955 (270 WIN, 30-06, 358 WIN – but not 243 WIN that was MC only) ANY 1954-1957 LC FWT should have a Win 22K.
1958-1959: The LC FWT was dropped from the catalog in 1960. Thus, it is possible that some LC FWTs were assembled 1958-1959. Since the Win 22K was no longer in use, I would presume that LC and MC FWTs would both have the Lyman 16A (as indicated in Rule’s book). Of course, it’s not clear to me whether LC FWTs were actually made after 1957, or whether the factory was just selling off inventory.”
https://winchestercollector.org/forum/winchester-sights/model-70-fwt-rear-sight-1953/And bsa, if you are finding this rifle for $700, I hope you are buying every … single … one.