A Mark

 a beginning, a date stamp, which is the most common mark there is, and nearly everything made has it.  To get the date right we must look at the Proleptic Julian calendar and 44 BC.  The Gregorian calendar didn’t start until 1582.  We must also look at 622, the beginning of Islam and the beginning of the Islamic calendar.  666 of the Julian calendar marks the beginning of Islam.  The Hijra. 
Watch for more pieces that fit.  Blessed is the one who looks.
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