Last December I asked for help in identifying several capacitors
(
https://www.eevblog.com/forum/projects/name-that-cap!/msg340184/#msg340184). One of two that weren't identified is the brown ceramic shown below. I had speculated that it might be a Matsushita, but wasn't convinced because the M wasn't fully enclosed in a box (see pic of a black Matsushita capacitor below). Or maybe it was a stylized version of the CM that many manufacturers use to indicate ceramic multilayer. In January in response to Dave's teardown of a Sennheiser microphone (blog 571), I asked what the tin can was that appeared at about 17:40 into the video and speculated that it might be an oscillator (see pic below). I quit following the thread after a couple of days, but then just looked again, and sq6rdy has posted a reply that it is a SAW filter made by muRata. Sq6rdy is absolutely right; that's what it is. However, the muRata logo on the can looks a lot like the one on the brown capacitor. A little searching turned up a pic of a recently made muRata cap (see blue cap below). I'm convinced that my cap was made by muRata. Double thanks to sq6rdy.
Mike in California