Sad to say you do NOT have an original carbine, as that number occurs in the midst of a range that is ALL rifles.

Carbines did not have slings of the type you describe. Is there a bar and ring on the left side? How ling is the stock, 30" or 32"? Also, if the receiver has been drilled and tapped for a peep-sight, value has been drastically reduced.

As to the handkerchief story, I'm sorry to say that points like that can NEVER be substantiated to the point of increasing value.

As to individual usage - we only have data on about 5% of the numbers, with only a few individuals listed. But, how could anyone research "42xxx"? Do you suspect that the gun was stolen? That is the ONLY reason for hiding the number.

Don't mean to seem harsh, but I hope that item was not sold to you as a genuine carbine, let alone a Rough Rider one. If so, you were the victim of fraud.

If you could post some pictures it would be a big help!! As Dick says the serial number is far out of the carbine range. But if cut to carbine length you should have a handy shooter/hunting rifle. It is amazing the amount of misinformation that is out there!! Stories get told a couple of times and suddenly they are gospel!!! So many official and "unofficial" changes were made over the years that pictures are usually needed if possible!!
There is a partial serial number list in the back of Mallory's book, I believe that Springfield Research Service has a slightly up dated list, but that info will cost you I think.
Enjoy your Krag!!!!!!!!!