need help identifying ancient coin [решено]

 Well, welcome to the forum after ten years. 

1 - where is the other side? 

2 - what is the diameter? 

15 mm

 OK - from those I made this combined page with the size. 

But - what on earth is the correct colour? 

First picture silver, second picture gold. 😶 

Bull and Horseman Jital

Edit: oops, someone already answered.

This is silver color.   But tested it.  It's not silver

I think is Tye 50

https://www.academia.edu/356700/Jitals

Jital of Mahipala Deva, Tye#39 

N#64378

The letters “महीपा” of "श्री म ही पा ला" (sri ma hi pa la) are clearly visible on the second image

Thankyouso much.   I'd never have found it.