My wife inherited a Colt Detective Special (.38 snub-nosed). It's a handsome little gun that shoots incredibly accurate out to about 25 yds. I've been able to determine that it IS a Series II Colt DS made between 1947-1972 since there is no ejector rod shroud. I've also been able to determine it is NOT a post-1966 DS because it has no wrap-around grip nor is there a letter preceeding the serial number. So now I'm between 1947 and 1966. The serial number is 548xxx. I've not been able to get any direct assistance from Colt Manufacturing. Any help you might give in narrowing this down for me would be very much appreciated. Thanks.