Hi Khanjar ,
Thank you for your comment. It is always nice to have new threads about gun here ,those threads are not so many and most of the post in this section are about bladed weapons.
I found a similar curve stock and "cutback" in Firearms of the Islamic world P176
About the mark yes you are right many gun I saw from India were with arsenal number.
Also It make me remember one of my old thread about Tibetan mathlock gun.
http://www.vikingsword.com/vb/showthread.php?t=16923
Best
Cerjak