Arabic silver coin that I can't find in the catalog:

Here is another stumper:

~8.9 grams,

~20mm,

~4mm thick.

Definitely Arabic and silver

I cannot find this one in the official catalog, so either it is there and I haven't found it, or I may need to add it once I obtain further information.

Looks very much like a Tanka from the Delhi Sultanate:
N#41562

Some forum posts about similar coins:

https://en.numista.com/forum/topic61379.html 

https://en.numista.com/forum/topic125276.html

Just a hint, further research may be needed.

The suggestion by ArnoV  shows brass forced tankas and although you say your coin is definitly silver it doesn't look like it in the photo.

The script on the coin is correct for a forced tanka and the weight is near enough so it's probable it has been silver washed, l have examples of this myself as when the sultan recalled the coins for a refund then attempts were made to fake them.

I can clearly see the mint is dar-al lslam on your coin, dated ah 732