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I spent some more time by passing it through a bengali friend, and it's not bengali as well. Doing a google image search, also does not match the exact language, so I guess, some local script is used.

I was in Vrindavan. What language or scripture is used there? Maybe it's sanskrit?

I have heard its Braj Bhasha.

My friend is a Krishna devotee and he's living in Vrindavan for many years. Maybe he knows...