Why would they use such a narrow topped one..?..
I looked at a zoom photo of the 1 and sort of detected 2 tynes sticking out of the central column and also saw a faint smudge to the left of the top of the 1. If what I see is not an optical illusion , this could indeed be a "dropped 1". Dropped 1's are silver dust and crud accumulations in the die which are dropped in a lump on the planchet before a strike. This explains the narrowness because the cavity of the 1 is narrower at the bottom. If this is a dropped 1, it is not a variety---just a doubling error.