"73's" appears to go back farther than that:
http://www.mikezulu.com/73s.htm
See esp. the QSL cards at the bottom, signed by the old man himself.
73s, Wayne Conrad KF7QGA
On 07/18/11 13:01, n...@n5ge.com wrote:
>
> I'm of the opinion that it started in the early CB days when all the CBer's
> were
> putting "Seventy Thirds" on each other when signing off or going to their next
> harassment frequency. ;o)
>
> 73's or 73s, whichever it is, is still incorrect. Would you say "best
> regardses" to someone?
>
> 73 is the number used in Amateur Radio messages to represent the phrase, "best
> regards", in order to shorten message lengths. If you said 73s to a message
> handler he might ask you how many 73s you wanted him to put in a row in the
> message.
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