Here's some info on the Post-Detective Special Colt's.
When Colt discontinued for the last time the "D" frame Detective Special revolvers, they replaced it with a totally new gun, built on a "SF" or Small Frame action.
This is a totally new, transfer-bar ignition gun, which was a modified version of the Trooper Mark III/King Cobra/Anaconda guns.
Oddly, Colt used the SAME "Vee" spring to power the hammer as they used in the "D" frame Detective Special, NOT a coil spring.
In the "SF" frame, the upper leg of the Vee spring powers the hammer, but the lower leg does nothing but act to tension the upper leg.
The first gun in this new "SF" series was the SF-VI, or Small Frame-Six Shot.
People wondered about Colt giving the new revolver this really catchy name, but the reason was, to eliminate any confusion with the discontinued Detective Special which was still in the wholesalers pipeline.
As soon as the last of the Detective Specials were off the wholesalers shelves, Colt simply renamed the SF-VI as the DS-II, or Detective Special Two.
In the late 1990's Colt chambered the "SF" frame in .357 Magnum, and named it the Magnum Carry.
All three of the the "SF" series guns were identical except for markings and caliber.
In the early 2000's, Colt had to eliminate many models to survive financially, and most of the revolvers, including the "SF" guns were discontinued.