I found that shell design on Project TamaShell (may or may not prove its rarity) and after doing a search on Ebay under both "clear tamagotchi" and "transparent tamagotchi", I didn't find another version of it selling. In my past browsing of Ebay I haven't seen that shell before and it seems that the similar clear blue P1 with yellow buttons is more common. I did another search, this time under the sold listings, and found 4 matching models (somebody labeled it as "extremely rare" but everything they've sold was labeled that). That was on the Canadian Ebay and I did go over to the US Ebay and do the same searches (it seems things are cross-listed). I found 4 models again in the sold listings, but I recognized some so they were probably cross-listed on both Ebays.
I'm not quite sure how to interpret this and a brief search on the forum didn't bring up any guide for rarity (if there even is one). I know for a fact that special edition shells are definitely rare and have found by
this website that the clear pink clock face shell and white with pastel swirls are rare. But, if you plan to buy another of the shell you have, I imagine you'll have to wait awhile, and in that regard you could deem the shell "rare". Personally, I feel that clear shells are rarer than the standard solid shells.
