The Blue Book of Gun Values has some pretty good info. in it. (You can get it from the library, if you don't want to buy it). The gun value part is suspect with the volatile gun market's fluctuation, but good for information.
5 1/4 Tapered stainless steel barrel, (model KP514 DISCONTINUED 1994), is what I found.
Standard Mark 2.........Serial # started with, 18-00001 mfg. 1982-2004, thinking that serial numbers for what your talking about, is in that group.
I remember seeing several, back in the day at gun shows, and gun stores.
Hope this helps.
HS58
