Sometime between 1948 and 1991. If there is no serial number, then sometime between 1948 and 1968.
I'd like to be a little more specific on the date. I have the little circle with an "F" in it. Is there any better or closer date system? The Letter that is circled is a year code. A is 1949. B is 1950 and so on. I have the same year as you so yours is 1954.
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