Very nice 46 - would have guessed 1960 based on SN. Suggest you DO NOT shoot anything but std. velocity ammo as it has the earlier square cut slide - one of the last ones with that type slide.
civil1977,
Have the letter, and it shipped May 2nd, 1961. Thanks for the kind words.
Tom,
Good advice (as usual).
I shoot a later (rounded slide) 46 for bullseye, as well as a 41.
As an additional safety measure I've been using slide-buffers from Buffer Technologies on all 41's and 46's for years.
Don