1868 Thin Figure 01 68 ?

[James Ford]

 
Fritz,
 
Thank you!
 
If we stay at this long enough, you may someday get me up to speed.
 
Best regards,
 
James

[Fritz Aebi]

Hi James
This is a trial printing for the district/year numbers, usually found on thin figures stamps. You can find them with all kind of numbers, sometimes even several (different) per stamp.
Fritz

[James Ford]

 Hi folks,
 
I recently obtained this 1868 Scott 46 Thin Figure Hidalgo Imperf with a pen cancel on which the overprint appears to 01  68.  The 01 puzzles me.  I don't recall seeing a leading 0 before.
 
Heath and Stout, on their table on page 137, show the Imperf 1  68 Mexico marked with a single cross which "Indicates a reported and probable item yet no rarity will be assigned".
 
My question for those of you, who would care to weigh in, is:  Is this rascal an Imperf 1  68 or is it something else?
 
James