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In western numbers and Arabic calligraphy, the date in this rug is:


Because this rug appears too new to have been woven in the 1920's, we won't apply the lunar to solar calendar conversion factor when we convert the Islamic date. Thus, we convert the date like this:

Islamic date + 622 = Christian date


1350 + 622 = Christian date of 1972

This Bahktiari was presumably woven in 1972.
This example is straightforward. The real fun begins with a rug that looks old enough to date perhaps from the 1920's: do you apply the lunar conversion factor (which has the effect of making the rug older)? Guess what the rug dealer would do! (sorry, this question is such a no-brainer we offer no extra credit for the correct answer).