Question can't be answered as posed.
If that is a US Patent, you can look it up on Google, and tell when the patent was issued, but it cannot date the gun- other than we know it would have been made AFTER the patent was issued.
AFAIK, Colt never made a single shot pistol
The moonwalk is not patented, the shoes that were made for the Smooth Criminal lean is the one that has a patent.
Can't be answered.
1943
1934. A rather early pistol.
that would depend on overall condition and when it was made. by furnishing the serial number it can be determined when pistol was made...............
Impossible to answer without the serial number.
1921
Serial number
made about 1897
It should be marked as to where it was made.