Hi Roy,
I believe it is this one,
https://en.numista.com/catalogue/pieces49942.html
The major variations of Sikh paisa of this period is the mint mark of Katar, Flag, trident etc (apart from leaf). We have a few listed in
numista.
"The Coins of the Sikhs" by Hans Herrli is one of the best book for this type. I am going to get a copy soon

.
Regards...
Sujit