I think this dagger have already been discussed here. I'm sorry to say, but the conclusion was that while it's made in the Qajar, 19th century style, the blade is most likely a very modern imitation.
P.S. Iran, shia and northern India have very different opinions on sharia than sunni orthodoxy. It's not unusual even to find icons (Mohammed, Ali etc.), which is haram of all haramiyya
.