maybe we should simplify this a bit
https://en.numista.com/catalogue/pieces1608.html

and the entry in SCWC

In my opinion we should reduce the entry to just one year line for the Calcutta 2001 coins for each of two types 154.1 and 154.2. I have not found a documentation for the "normal"/"serif" 1, neither for the thin center line in the security edge.
This just because in a recent swap I got the version with a "normal" 1 and found out it's the same as the coin I got some years ago with a "serif" 1. Honestly, they are the same? See below.
From the swap

From my collection

It's not the first time I say that, but we should NOT accept variants with NO images to back them up! Of course, here it's coming from the SCWC, but as we know, they have plenty of errors! Specially we have to be careful with Indian coins and their varieties (plenty).