SC, the 2.5" Python in matte stainless was non-special produced approximately 1983-1996.
First 2-pin front sight with Medallioned Pachmayrs, later 1-pin, and the 1-pin with non-medallion Hogues like yours.
Have not heard any # produced figures on these snubbies - only the special production ones- like the ported Lew Hortons.
Don't know of any way to find out, as Colt not saying...
The later 1-pin Hogue units not rare nor scarce, just definitely less common than the earlier ones.