I'm not sure how this is all that different from rifles like the Ruger #1, which is produced in limited numbers each year in only one or a couple of chamberings. The next year they move on to different cartridges. Each production run is "limited". Collectors also love to search out years of production, looking for that elusive first-year-production specimen which is identical in every way to successive years but seems somehow more appealing and irresistible to "collectors". Shooters generally don't give a crap.
I also seem to recall a few instances in the past where a maker introduced a new rifle that would be limited only to a single production run of X number of rifles. In at least a couple of cases, the demand was intense and the makers decided to turn the gun into a regular production item, but successive production runs had some minor alterations that kept those first guns unique and didn't pull the rug out from under buyers like the OP who bought the thing as a collectable.
Is this gun by any chance marked as being "Number whatever of 1000"? There ya go; it's unique.
Hell, I have a rifle listed in the EE now, which a potential buyer inquired about. Upon checking it out, I was surprised to find that it was from the first year of production; no different than successive years, but...I dunno...maybe I should increase the price on it?!?!?