For example: It has been my understanding that the 'MK IV Series 80' moniker was only used on the left side of the slide from 1983 through 1991 (even though all the guns made after 1983 are still mechanically Ser. 80's on the inside, whether marked or not). Then in 1991 they started using the '1991A1' in big bold lettering (like mine) on the left side. Then, years later on they went back to putting 'Series 80' markings on there, but this time on the right side in smaller lettering. I know this isn't date-specific, but thought it might help to narrow down the search range. 'Guard with jealous attention the public liberty. Suspect everyone who approaches that jewel.
Unfortunately, nothing will preserve it but downright force. Whenever you give up that force, you are ruined.The great object is that every man be armed. Everyone who is able might have a gun.' ~Patrick Henry For the Patriots of this country, the Constitution is second only to the Bible for most. For those who love this country, but do not share my personal beliefs, it is their Bible. To them nothing comes before the Constitution of these United States of America.