That is a pretty sweet looking drum there!
My guess is that it is a "non-traditional traditional" hand drum. By this I mean that it is modeled after a traditional hand drum (I'm guessing atesimevu or ngoma or atabaque) but the use of modern hardware makes it an anomaly in traditional circles.
I have a Ghanaian atesimevu shell that was mounted with steel hardware which has a very similar shape to your drum but it is hand-carved from a solid piece of tweneboa wood. It's not an atesmevu anymore but it sure ain't a conga either! It is unusual and it's also a really nice sounding drum that projects sound really well (yeah... loud!).
If you were to try to match this to a particular type of percussion ensemble you could try Brazialian capoeria. Just by looking at it, with the right kind of stand that you would probably have to make yourself, it could stand in as an atabaque. Although the dimensions don't really match the atabaque's
http://www.gope.net/UK_Produtos_Atabaque.htm . The ones that I have seen have all been rope tuned but that shouldn't stop you from playing the rhythms if you are interested in learning them!
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