I would have to say YES its a die crack. I just bought a RCM roll and found 9 out of 25 with this DC. Mine are just visible (early production from this die after it cracked) but its the same shape and location as yours with the DC curving upwards like your second pic. None of mine have the little tail on the '1' in '2013'.
Sorry I was unable to take a clear pic of the DC but I'm keeping a couple of these in my collection as a minor variety!
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