The better page of the article: http://www.south-pole.com/p0000143.htm In summary: something less than 6,000 were delivered promptly with the January 31 cancel, and the remaining 50,000 or so (with January 30 cancel) had to be held for a year, with all of the latter getting the delay handstamp.
Here's my example. Dated January 31, 1934, with a notation on the back that it was actually received one year later. I think this is the most common variety.
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