These are modern firearms , made during the 1970's. Colt reintroduced their Number 3 derringer in .22 Short in 1959. These were made on and off by Butler for Colt until 1978, In 1978 Colt dropped the derringer and Butler then sold these derringers under their own name until 1980. They were sold singularly and as sets such as " Lord and Lady". The bad news , they were made of very soft Zinc alloy without even a barrel liner. Even shooting the .22 Short will strip the rifling in a very shot period of time, so they are not even shootable "fun" guns. Really for display only. Value, in the condition you described, maybe a hundred dollars maybe less.
Yes, Colt has and continues to make automatic pistols.
'Colt'.................
Depending on what it is, yes. You have to call Colt to find out for sure.
Around 1857
Colt's
In Hartford, Connecticut.
I believe Colt pistols ARE sold in Canada, however, SOME Colt firearms are restricted arms under Canadian law, and require special permits to purchase.
No
You will have to call Colt since you did not provid the serial number.
Butler Single Shot 36. cal. Rock hill, Connecticut .1857
See link below
Fourth variation.