Help me identify this Silver Tibetan coin [solved]

This is a silver looking coin from Tibet? but I am not sure which one. 

Size: approx 25.7 mm 

thickness 1.1 mm

weight 28 grams

Also, any way of knowing its authenticity would be appreciated

Or nepal…

28 grams? Seems way too high.

https://en.numista.com/catalogue/index.php?e=nepal_section&r=1+Mohar&st=147-150-149&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=&i=&b=&m=&f=&t=&t2=&w=&mt=&u=&g=&c=&wi=&sw=&p=2 

Here

How did you get 28 grams?

Sorry that was supposed to be 5.28g

Yes Nepal seems correct! Apologies for my mistake! 

I'm not sure how to read the date on here. Can anyone help me with that? I'd be keen to understand which coin it is

Answered above.

This might help

OK thank you so much! So I'm guessing this is the coin

N#33988

Thank you all for your help