I was in printing for a very long time...That being said, The cards would have been printed first and then go to the bindery departed to have them round -corner. So the cards from the 80s could have never made it to be round-corner. Just set in the warehouse waititng. This is just one more think to think about.
Those that were printed in 1949, the stock or say paper could have been changed. I believe the design was changed on the stock and square-cornered... to note the two different years' offer., 1947 and 1949.
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