Knew it too? Nope. It's in my photo archive, yes, but I've been wanting to get familiar with a version of this cart/stylus for a long time, namely the Concord CIM-50 or 60, which uses a very similar but not identical body (stylus looks very different, like the YM-127's) and is a tripole design that's different from the ones we know in the US (and Italy) as Acutex.
(The Sony VL-100G and its twin Piezo YM-309 are two others I'm trying to get, so as to be able to show off to my tripole friends.)
Are the YM-121 and 127 tripoles too? Dunno. [UPDATE: They're not.] They're among the Azden/Piezos or variants that refuse to drop into my lap. Clearly-identified photos of the YM-127 body are elusive, though there are some likely candidates that don't have a body magnet like the Concord's.
A walk-around of the 121 stylus can be seen on turntableneedles.com (abbrv'd as TTN around here) as the 7993-black-- at least you can see where that big black pin or horn or dowel goes. That would be an ideal place for an inducing magnet, but is it? Maybe the OP can tell us.