Initials of the owner aren't part of the serial number. There are very few so-called factory seconds out there. They have been marked various ways, FS, B, 2ND but we stopped considering things like the shade of the wood as a second, and simply wait for the right person to come along that it appeals to.
There's probably about a dozen or so instruments marked this way (and probably other ways as the mood determined that day). For at least 20 years we have not released a so-called second. If the instrument has a failure, it is simply either not completed, or it is kept for doing experiments and training, but they aren't serialized.
Sometimes, personal project instrumens will have the initials of the builder as part of the serial number. We don't have records of most of these instruments.
It will probably be sometime next week when I do another round of serial number research. I'll post to your history request then.
