I obtained a set of John Hurst grips for a Colt E/I frame and installed them on a 1966 Colt Trooper 38 Special.

I love those old Troopers. Unwisely passed on a .357 Trooper several years ago, still regret that.
They appear to be for an unaltered frame. I am not sure Hurst made grips that required cutting the frame toe, I thought that was a Fuzzy Farrant thing. But it’s still before 8M and I’ve already been wrong twice.Very nice !! Are they for a standard frame or for a clipped frame ?
Here's my 38 Trooper from late 1965. I've owned a couple of the old Trooper 357's over the years, but this is the only one in 38 Special I think I've seen.
I don't know the production numbers, but most Troopers chambered in .38 Special only were the early ones from the 1950s made on the E frame. The .357 version of the Trooper was introduced in the early 60s but built on the I frame, pretty much the same as the E frame, except that the firing pin was in the frame instead of on the hammer. After the .357 Trooper became available, there wouldn't have been much incentive for Colt's to continue making Troopers chambered in .38 Special only, but evidently there are some like yours. But probably not many. There were also some Troopers made in .22, but I don't remember ever running across one so they must not be too plentiful. The whole idea of the Trooper was to compete with the S&W Combat Masterpiece for the Police market.
Colt introduced the 357 built on the I frame around 1954. In its 1st year, they were simply call the "Colt 357". The following year they became "Troopers". Here is my duty weapon from 1954. Dad bought it new and gave it to me when I started the Academy in 1977. Still shoots great.
The Trooper and the .357 (that is its name) are nearly the same gun, but are considered and were cataloged as two different guns. The ".357" did not become the Trooper. As noted, the early Troopers were built on the E frame while the ".357" always used the I frame. The ".357" was considered as Colt's Top-of-the-Line revolver model at that time, while the Trooper was chambered in .38 Special and was more utilitarian and oriented toward the law enforcement market. Production of the ".357" was terminated after the Python came out, as Colt didn't need two Top-of-the-Line revolver models. While the ".357" is not a Python, all but cosmetically it is identical. And far less common than the Python, with only around 20K of them being made.
They appear to be for an unaltered frame. I am not sure Hurst made grips that required cutting the frame toe, I thought that was a Fuzzy Farrant thing. But it’s still before 8M and I’ve already been wrong twice.![]()
Hurst also made grips for cut frames. Pictures are 2nd gen Hurst also for a Colt.