The Marsha is one of Dave's early production BE/HBE models. Mine is 50 watts with the simple clean, C45, Fat, SAT and treble reducer. From what I've read, the earlier versions are much more open and less smooth. As refinements were made, I guess the amp has gradually gotten more dark/smooth, or whatever adjective you want to use. I bought it used some time ago, but about the price of an average BE100. Well worth it to me. I think it was made in 2010, but don't recall exactly.
Dave does do custom runs every so often. Not sure what his current plans are, but if you email him, he usually responds pretty quickly.