Possible Afghani matchlock

[45Auto]

Hello everyone, I recently acquired this item. I cleaned the bore and found an old mud-wasp nest as well as some cobwebs. It's about .64 caliber.

Given the shape of the buttstock I'm wondering if it would be considered an Afghani style? Further, it has an interesting double compartment on the right side near the breach.

Information would be appreciated.

Thanks in advance.