1954 Modified, Serial 10 Million?

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Our favorite (?) auction web site has a s/n 10,000,000 1954M $1.00 listed, with a PMG cert.  I thought that 9,999,999 was the highest number used and that the counters only have 7 digits.  The scans are not clear in my browser, but the final zeros appear to be bolder than the rest.  Am I mistaken?  Any thoughts?

 Item number: 160203803696

blumax

You aren't wrong - the counters had seven digits, so the final zero on each side had to be added by hand.  That is why they seem bolder, and perhaps just ever so slightly rotated.  The present system of numbering from 0000000 to 9999999 seems to have started at about the same time the signatures were put in the plates, roughly 30 years ago.

The present system of numbering from 0000000 to 9999999 seems to have started at about the same time the signatures were put in the plates, roughly 30 years ago.

I think you mean 40 years ago... (1967 or thereabouts).

Yep that's what I meant.  Gee, is it 2008 already?