I noticed this auction on eBay:
L I N K
Uzdenikov lists this only as a novodel (Uzd. 3039, /N/), but Brekke lists both an original and a novodel (117 and 118). Both have the same edge pattern and no differences in design are noted.

The coin being auctioned is probably an original strike, I would think, because a novodel is usually in much better condition. Other than that, is there any other way to determine whether or not this might be a novodel?

Bobh, I got fooled by the way how Uzdenikov lists a coin as novodel or not. Appearently, if it is STRICTLY novodel, what Uzdenikov would do is to list them as italics like how it is in Uzd 3007-3019.

That means that the 1804KM do exist as both novodel and original.