A 72 in the reverse field of 1967 1c sms

I have searched for this variety and haven't found any info about it.

ther is a 72 in the reverse field underneath lincoln memorial.

the 7 is fairly prominent and the 2 is barely legible.

the coin is a 1967 1c sms ngc ms 68. I purchased the coin through Teletrade. here is a link to the page.

you can use there magnifier to see the 7 http://www.teletrade.com/coins/lot.asp?auction=3239&lot=1248

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