Nice find ! I am under the impression that this one is not so scarce anymore. Recent finds ?
Some others were shown here and here.
I think this is occuring with Islamic and Indian coins in general, the current interest has flooded the market and we can no longer rely on old catalogue rarity definitions, a Suri Paisa listed as rare was exciting for me to to discover several years ago but it somewhat deflated me when I discovered several more and I now have 5 of them!
It also works in reverse as many coins listed as apparently common rarely seem to appear

The new series of Sultanates books being worked on by Stan Goron & Paul Stevens should be able to take into account all the new discoveries for India. Apparently many of the original photo's have been lost and they are also requesting photo's of unlisted types & dates