Every thing is a limited edition.
Even Volkswagen Beetles were a limited edition. Only 21 Million were made, and they are not making any more.
When you buy Gun Blue Books, the pages of limited editions of M1911's, M1894's, etc, fill chapters.
A limited edition might be worth more if in absolutely unfired, unplayed with condition.
If it has been fired, then it has zero collector value if there was ever any additional value due to collectability.
What you want to look for is features. Are the features things you want?
I have a 1988 M25-7 S&W in 45 LC. Only 2500 made. It has a heavy 5" barrel and unfluted cylinder. I like these features, and if they made a stainless version I would pay slightly more for these features.