Check your 5d if you can. To the inside of the letter "d" there are 2 types listed. Type 1 "Squarish dots beside "d" 2009 catalog value of $90.00 USD or Type 2
"Tiny vertical dashes beside "d" catalog value of $11.50 USD. Might be hard to tell on that one as the cancel covers both areas but it's worth a shot.
Examples:
Type 2

Type 1
