Most likely the gun shipped in 1955. I have a pair of 1950 Target 44s that are S140000 and S143000 (so this one falls right between them) and they shipped in April and October of 1955.
Also, has anyone EVER documented a gun other than a 29 or a 57 shipping with "Cokes?" First of all I doubt any did and if there were any so equipped I suspect the letter would not prove it. Does a letter ever say "shipped with Cokes?" Seems like all they say is "shipped with target stocks."
Saxon,I hope it did ship with target stocks.I could match it up with a unnumbered pair.It would be impossible finding the correct magnas for it.Mike