Interesting - Supica is the best we have for the newer stuff - S&W (Jinks) has ship dates. Where it gets fun, the frame batches are processed last in - first out, so in a slow moving inventory, it gets interesting trying to match SN and ship/mfg dates. 41s are somewhat slow movers due to cost over last few years. First "that far off -early" I am aware of on Supica data.