We had several puzzles in our text-criticism class today; but perhaps the most puzzling one was in Rev 4.4 - the first variant on the twenty-four thrones (thronous eikosi tessares).
The first puzzle was what on earth 0273 is doing in the NA27 apparatus, when this is a fragment of a ninth century majuscule of John's Gospel! [Answer ... sadly ... a typo for 2073; but this emerged only after class when I checked a couple of other sources]
The second puzzle, for which I don't yet have an answer, is why the reading supported by 2073 was supported by earlier editors (notably Tischendorf and Nestle)? The external evidence and transcriptional probability seems so strongly to favour the text reading I can't see any reason for the uncertainty which the cross normally suggests.
Any thoughts? What am I missing here?