There will always be the occasional "late shipped" gun having bits and pieces that were released considerably after the gun's serial number might indicate, or the occasional gun wearing some older bits from way earlier production that just floated to the top of the "parts bin" at final assembly. He can, for instance, occasionally come pretty close to revealing within a month's time when certain features/parts were changed in a run of a particular model. His serial number breakouts are considerably more precise than anything Ruger has put out, and his discussion of which parts were used when is further informative. Knowing the month as well as the year certainly helps since the various "type" configurations of many of the Old Models are pretty well known and documented in Chet15's Red Eagle News Exchange Reference of Ruger Firearms. They could be widely different particularly in the early pre-90s era when large runs of parts were stock-piled and assembled in no particular time order. The shipping date is good to have a s a base line but it tells you nothing for sure about the manufacturing date of the receiver or any of the parts.
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