These have started to turn up regularly over the last year or two. They clearly represent a specific type and not just a couple of atypical anomalies.
I was leaning toward the Burmese attribution as proposed by Jonathan (Spiral) and others.
But I would have expected a 'more Burmese' scabbard if that was the case
As I said above, the scabbard on it's own would make me think Algeria/North Africa.
The stepped bolsters also remind me of the Khodmi.
Here are a couple of pictures of a Khodmi of mine to show where my meandering thought process is headed.
Sorry it's still in the 'to be cleaned' group!
P.S. This Khodmi is dated 1929.