Ran across this item this morning - I only clicked on the details because of the apparent high price for what, on the surface was presented as a standard rifle.

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The serial number, 387712, is "close" (387668 is a standard rifle; 387780 is believed to be a real 26") but nothing else is known from the same cluster - they seem to show up in handfuls.

The length looks OK, but the rear sight is NOT the rare one - an immediate red flag, since, if the gun is right, why remove/cannibalize the sight? The front base looks OK, but the blade (they are slightly different) appears to have been reshaped, or may be a commercial replacement. The stock, of course, would provide the definitive clue, but no photos or data are given. If the stock is proper, then I'd assume the rifle is proper, but with a very expensive deficiency.  However, if the rear sight had been right, you would not be reading this until I'd bought it!

I've been (almost as a joke/game involving 5MF) looking for a third one - to stack arms [!] - but that one (as offered) is not my sought-for sleeper deal, and is financially out of reach.

The seller knows what he thinks it is - but someone else will have to settle the matter. Have fun!