1917
1917 for the Colt model 1908 hammerless .25
Lacking any more information, 50-800 USD or so
That Colt model 1911 was a commercial model, not a government model and based on the serial number, it was made in 1947.
about 1948
That Colt was made in 1943 by Remington Rand under cotract to Colt Mfg. Co.
You will have to call Colt to find out. SN data published does not cover it.
1929
You will have to call Colt with the serial number to find out.
The National Match series with NM in the number started manufacture in 1957. The serial number 17235NM was built in 1965
You will have to call Colt with the serial number.
Need to know if it is a derringer or rifle.
You will have to call Colt with the serial number to find out.