The attempt to equate those things spoken of in the Apocalypse to literal physical events or items has led to many bizarre interpretations of the book. The thing that must be kept in mind from the very beginning in trying to understand the work is that the author specifically that the divine author έσήμανεν — "he signed it" (not John, the apostle, who who long before died in Jerusalem (see the introduction to R H Charles' ICC commentary on Revelation
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(d) The Syriac Martyrology postulates the martyrdom of John the son of Zebedee. This martyrology (411 A.D.) was drawn up at Edessa for the use of the local church. It contains the following festivals:
Dec. 27. Ἰωάννης καὶ Ἰάκωβος οἱ ἀπόστολοι ἐν Ἰεροσολύμοις.
Dec. 28. Ἐν Ῥώμῃ τῇ πόλει Παῦλος καὶ Συμεὼν Κηφᾶς.
Op cit, p. xlviii
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Note that John is said to have been martyred
in Jerusalem which would place the time prior to 70 ad in keeping with Mk 10.35-40 // Mt 20.20-23.
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An attempt to understand what is said too literally neglects the character of the work as "signs." To understand the signs one cannot simply choose whatever happens to pop into one's head on reading a passage. To do such opens ones' self to any of a virtually infinite number of possibilities. It would be possible to understand the βιβλαρίδιον of 10.2 as a Hershey bar since he is commanded to eat it and that it is sweet in his mouth but upsets his stomach. The only valid equations which can be made are to passages referenced in the OT, noncanonical literature and even, in some cases, NT passages.