After hunting the internet for a decent picture of one of the single shot .410 derringers that, I am sorry to say are made less than 50 miles from here...
I remember the father of the feller that started either Ingram or MAC (It's been so long, I don't remember) used to be a pastor at one of the local churches when I was a kid, if I remember correctly. Of course, this company has gone by the names of several monikers (FMJ, Leinad, etc.) Of course, I think these fellers also make the Cobray line of guns.
I bought one once...it was a handful. Pretty handy in the pocket to take while trout fishing. Also, if you dropped it, you definitely haven't lost anything.

However, it's clunkyness and terribly awkward safety as I found out didn't make it good or even safe for carry at all.