According to the book, this serial number is just over the one mentioned in the book for a pre M45 M&P 22. # C 407568. It is not model marked and was shipped 6-1958. It also has PC stocks numbered to the gun. Most I have seen have the standard magnas. No PO or PD markings. Eventually, I will letter it.
Anyone have any info on it? The bbl. and cyl. are not numbered. Thanks, Big Larry