Vikram:
In my opinion, you may have a "Purdey." But the chances of it being a product of James Purdey & Sons of London, England, are slim indeed.

I've examined the photos. And NONE of the typical Purdey fit, style and workmanship is present. In addition, the inscription on the top rib is so clumsily done and inappropriately composed as to be almost comedic. All other factors follow suit.

God knows where this thing was made. But in my personal view, it wasn't London.

Best, Kensal