Need Help Identifying a Derringer
I am doing some research on a Derringer that I recently inherited from my Grandfather. No brand, only serial number under barrel "7408" which appears twice - see pic. It also appears to be all one piece - barrel does not break, swivel, or screw on/off like others I have seen. No idea how it could be loaded.
I think it may be an Iver Johnson, but want opinions on make, model, year and value. Anything else you know about it or where to go for more info would be appreciated.