These 3 pics show some fake carbine sight markings. None of these Mark's have the "ear" on the top of the C. That does not mean that there are not some fakes that have that. The first pic shows uneven wear on the marking. The second has a double stamp. The third is on an out and out fake sight. So mind your "Ps" and "Qs: but watch your "Cs".

1. A real "C" on a real model 1898 carbine eye-piece.

2. An incorrect "C" on an altered model 1898 rifle sight eye-piece. (On the '98 rifle eye-piece, the three notches were slightly off-set to the right for 'drift'. (Carbine eye-piece notches were not off-set to right. The Center Index Mark, "C", and Center Notch should all be in a straight line).

"Reproduction" or "Fake" ?

S&S Firearms is a nice company and I get some minor Krag parts from them from time to time. They have a lot of original parts.
When original screws and knobs are unavailable, S&S offers some reproduction parts. This is useful.
(I prefer it, when newly made parts are not exactly made like the originals and readily identifiable).

In recent years, S&S has "Re-manufactured" some original sight parts. They have altered the ramps of 1898 and 1902 sight bases and marked them with a "C". They have ground 1896 sight leaves and re-marked the graduations.
(FWIW - I disagree with this practice. Although, it does not fool the experienced, it ruins original parts for no good purpose. Someday, it will cause confusion).

At gun shows in recent years, I find myself often unable to tell if some canvas & leather items, and brass buckles, are original or reproduction? By revealing fraud pieces on the internet are we training Fakers? Its all a slippery slope!

(A lot of people view the KCA Site, but, never reveal themselves ... hmmm ... just thinking).

Pictured is a complete 1898 rifle sight. Next to it is an 1898 leaf with a Faked eye-piece.
Although the bogus "C" is centered with the 'index-mark', and doesn't look too bad shape-wise, there is disruption of surrounding metal and the three notches are off-set to the right. (It is a rifle eye-piece).

Presently, there is probably more faking going on with M1 Garand rifles and M1 carbines.

Legitimate arsenal rebuilds are routinely being 'parted out' and reassembled to make them more original! ... including, Chinese parts too!

With U.S. Krags, IMO, the main problem has been efforts of some sellers to pass off altered 'deer rifles' as carbines or rare models for the past 70 years.

"Fraud" is rewarded by impulsive & uninformed buyers.

Good gun books are a better resource than the internet.
"Know, before, you spend Dough".

Still, most of us get fooled, from time to time.

Nice display wall, CadCord!  Can't beat that kind of MilSurp collection.

I have a couple of those old GSA Carson City Morgans from when I was a kid. Nice treasures now, like you said. I didn't realize people broke them open that much. Mine's still intact, fortunately.