The U.S. Navy stamped .38 Military & Police could have been from early 1942 to early-mid 1943 - you just need to give us the serial number from the bottom of the grip frame for a date.
The Colt (presuming the barrel is original) is the alloy frame version of the Detective Special, named the Cobra. Colt revolver serial numbers are found in the location you showed in photo #3 above, we can help date that one too.