I checked my information The Smith & Wesson 39 variations
It states in 1964 Paris Theodor produced some 250 guns under Seventrees Ltd then went out of business, in 1976 ASP took over and production continued until 1987 production was approx. 3000 guns, guns were shipped with 3 mags and modifications cost was $700 in 1982. There was also later produced ASP Quest For Excellence with production at 100 units they came with Buffalo horn grips, presentation book case and letter opener.

The Devel was produced by Charles Kelsey and Ken Hackathorn and was introduced in 1978.
There were 3 levels of work for Devels
1st level was function and reliability modifactions
2nd level was called Basic
Shortened frame
Barell cut to 3 1/2 inches
Slide cut back 1/2 inch
Permanent bushing to slide
Feed roller ramp added
Custom springs
Red front sight insert
Modified tang, hammer spur removed, flared mag port,
Devel electrolysis nickel finish
3rd level was Full House
All previous mods plus see thru micarta grip
Slide lighting cuts reduced weight
Modified trigger guard
Ambidextrous safety
Belt, holster, mag carrier, 3 mags,
Some time later these were available for the S&W model 59 and 459 pistols.

In august 1983 S&W put the model 469 into production and within a year the Devel company went out of business after modifying approximately 450 guns

I know i have been rambling on but I enjoy the oddball stuff.

By the way there are 39 and 59 pistols modified by Austin Behlert of New Jersey and Personal Protection Systems of Roseville Michigan produced these models called the Scorpion. I do not know any production numbers for these 2 companies.

Hope this helps!
Steve