I have P7s both with date codes and with numerical dates, but I also have one with no date. It's my understanding that all P7s had dates, so what's the deal with this one? It's a police trade-ins from CDNN. The slide has the serial number, then an eagle(?) proof in a box, then Nds in a circle (I presume for Niedersachsen). The frame has only the SN and the boxed proof. I've seen another P7 photo in a refinishing thread on another site, and other than SN it's marked (or unmarked, as the case may be) identically to mine. Any info?