That seller may, or may not, have gotten "something" wrong, either the color and SKU #, or the steel.
The "original" 1999 version of the FRN Calypso Jr. had a black handle and a VG-10 blade. These came in both PE and SE, SKUs would be C52PBK and C52SBK respectively.
The first "sprint run" version had a grey handle and a VG-10 blade. There was a second, and possibly a third, "batch" of the grey ones, also with VG-10 blades. All were PE and the SKU was C52PGY
The most recent "sprint run" paired a ZDP-189 blade with a burgundy (more like raspberry sherbert really) handle. Again PE only on this one, and its SKU is C52PBRG.
BUT... there is another run of ZDP FRN Caly Jrs coming, this one an exclusive for one distributor, whom Spyderco has never named. I believe these will, like the originals, be black, so the seller may also just be advertising those a bit early, as they won't be out for a few months yet, IIRC. If that is the case, then perhaps the "E" in the SKU listed on that site stands for Exclusive. The best way to find out what that seller is offering, if you're really interested in one, is to make a phone call.