Below the word Registered, it looks like the St. John's clerk wrote 6 + 9 = 15 to verify the correct fee paid. I hope this was required by regulation and not, well, (insert Newfie joke here).
On the numbers: my view is that there are two registration numbers here : one written by a clerk from St Johns from April 9, 1912 (and associated with the purple cancel and the two large "R"s).
Then another one in Toronto, associated with that postal offices ledger.
Impossible to know which is which, but it could be the crossed out one at the top was the St Johns one which the Toronto clerk wanted to not confuse within their zone.
Amazing when you think about an era where this occurred manually but efficiently
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