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We are dating these early Rubaiyats based on the second digit in the case serial number. In this case a '7', thus 1917.
We have yet to determine why these early models started with a '2' and the later cases of 1921/22 started with a '1'.
I'm sure that there is an explanation. We have just yet to figure it out.
Hi David, your Rubaiyat will be probably from 1917 because (by indications of Lisa´s analysis) :