I was told by an old gunsmith
He said if you are trying to build a match pistol based on a Gold Cup, buy the one with the small lettering on the slide vs. the large lettering as the slides with small lettering were harder. I have no idea if he was right or not.
Complete thread:
- Colt 7990314 Hard Slide - 
Charles, 
2016-10-07, 13:37 
- Now, I have to did something out of the safe... - Rob Leahy, 2016-10-07, 14:54
 - I was told by an old gunsmith - bj, 2016-10-07, 19:09