Here's my Musashino Labs labeled Onyx Signature (short body), probably minted in the late 80's or early 90s? I acquired it 7 years ago from the original owner's son. The story is that he went to Japan and came back with a $5K phono cartridge; everyone in his family thought he was absolutely nuts!
This cart was all original, never re-tipped, and still made absolutely beautiful music on outer & middle grooves -- though much of the stylus shank was now permanently encrusted with dirt, and the tip was audibly worn (affecting playback of inner grooves). This is the cart that sold me on Koetsu, though I immediately acquired a new Platinum model because of the worn tip. I finally had this one rebuilt by Koetsu this summer, retaining the original alnico magnets rather that upgrading it to platinum, and have it spinning again! Very nice cartridge!!
I got the original Koetsu headshell with it too. And it has a particularly lovely Onyx grain on that one side!