There are twenty-four or so textual variants in the Textus Receptus text of the Revelation of John which have extremely slim or zero Greek manuscript support.  Usually, two handwritten Greek manuscripts agree with these readings.  These MSS are 296 and 2049.  They used to be known as 57 and 141 respectively.

However, H. C. Hoskier, who did a two-volume investigation of all the manuscripts of the Apocalypse of John, says this about them in Text 2, p. 156, lines 26,27: “This MS 187 with 57 and 141 must not be accorded any weight whatsoever.  They are brought into the record because of their very connection with the printed text.”   See also Text 2, p. 156, lines 26,27, where he says “… 57 et 141 ex ed. typ. exscripti.”  The Latin means “copied from printed edition(s).”

In their own pages which describe each, Hoskier had this to say.  About 296 (old 57) he says in Text 1, p. 179, “I suppose I ought to eliminate 57 from the list altogether.”  And on p. 180 Hoskier says, “So 57 becomes Colinaeus.”

About 2049, (old 141) he says in Text 1, p. 474, that MS 2049 is most like Erasmus’ 4th Edition, because the whole manuscript is word for word to it, except for one word, in 22:21, ἡμῶν for ὑμῶν.  Which could easily have been an error made by the copyist when copying Erasmus.  This exact variant is one of the most common mistakes scribes made throughout the Greek New Testament.  There are a few uses of contractions, which differs from Erasmus not adding up to a word of difference, but that is to be expected from a scribe who was hand copying such a large document.  It is reasonable to conclude that 2049 is a handwritten copy of Erasmus’ 4th edition (1527).

Below are snips from his book.  I have also added these images to my Revelation with Greek document which you can download here.