Help identify my Converter

I apologize if I missed it, but doesn't your seller know where it came from? If you're not installing it right away, i'd wait and see if a few bumps here may give you a idea of who built it. Most builders keep records, and if you can determine it, the'll tell you what's up with it by the numbers. Even if you can narrow it down some, you can call a few of the builders with those numbers and see if they have any info for it or if those numbers ring a bell to them as far as who could have built it.