I know a few of the new harmonica players I meet are interested in blowing amplified harmonica. These mics don’t appear all that often in the UK (and postage from the US is crazy money). It’s a Shure 588SA, often called the James Cotton mic since he was pictured with and known to play one at times (see also the Shure 585SA and 585SAV). In any case, plugged into a decent amp it’s a cool harp mic. I’d grab it myself if I could justify it.