Given what is known about the production cycle model at Ruger -- new parts put in bins waiting to taken off the top for use in prodction runs; only receivers are marked with parts numbers; actual production of a given model and caliber are done in bursts over a year or more; and wide, sometimes multiple decades, disparities exist between entry into parts inventory, assembly, storeage, and actual shipment -- I doubt Ruger even knows with any preciaion how any of what were made, when. The only accurate recoverable date in such a system is the shipping date.
Even if you choose to concede that they MIGHT have kept this all straight for their own records, there is the phenomenon of the "one-ofs' including special rifles produced for Friends of Bill and by workers at the plant. Example -- I have a custom #3 with no irons made at the plant by the workers in 7mm BR with an english straigth stock and schnabel with no barrel band. The receiver serial # according to Ruger was for a 22 Hornet.
1B
