Like many other special orders that weren't fulfilled due to lagging sales(LH comes to mind) the 2500 figure could be very possible.
Many things that didn't sell well when they were in production are highly sought after today.
Think Edsel and Snake Guns.
I always have to laugh when I read about Lew Horton guns here on the S&W forum after knowing how they are regarded on the pony forum. I'm at least glad they are viewed more realistically on this forum.
Here, not many people put any extra value on a LH edition gun, and if they do it's only slight. On the other hand, any single Colt that can be linked to Lew Horton is pretty much a mandatory multiple thousands of dollars.
I just keep thinking "instant collectibles" and "novelty" versions when I think of special dealer runs. A lot of times orders were placed, sales were bad, and the remainder canceled. Now, they are used as a marketing tool to signify "collectability".
Personally, what I know of the Colt LH examples, they were pretty much all made during the '80s and strike years. Almost every LH Python I see is rather poorly built/finished in my eyes. I would only value them less than an early standard production due to quality, but the LH name means $3K+ to others.
To each their own though.
OP, you got a fantastic gun for a good price considering desirability. I will never understand why 3" barrels weren't made the standard for snubby 357mags, instead of 2.5". That extra 1/2" adds a bonus in many respects.
I'd have a 3" conceal carry gun if prices didn't prohibit it.