Proof right here!http://farm4.static.flickr.com/3324/3286569450_450193d8d6_o.jpg
Actually it was 1948 --guy made a typo-- that dang card hung in the old man's shack my entire life!
Old man was 11 when he worked that station, and on St. Patrick's day AND the day after what would turn out to be my birthday.
Unless it was my grandfathers card, but I don't think he ever held a "standard" or modern callsign.
73's Sláinte Mhath