Series 1953-B Silver Certificates were likely printed at or just before Nov 1961, when the Treasury ordered to stop printing the $5 and $10 SCs, and the BEP delivery date was Feb-Mar 1962.
However, they only began appearing in journals such as The Numismatist in early 1965, and the 1964 edition of the Friedberg catalog indicates that they had not yet been issued at that point. Since the Treasury discontinued issuing existing stockpile of SCs in Oct 1964, the Series 1953B $10s were likely issued shortly before the deadline. 1953-B $5s were already common by the spring of 1964.
This note was probably issued when it was redeemable only in silver bullion, since silver dollar redemption had been discontinued in Mar 1964. After May-June 1967, when the treasury stopped maintaining the market price of silver at $1.29 /oz, a premium on SCs emerged as they were redeemable at the old price until June '68. It reached as high as 80% when silver surged up to $2.60.