For your consideration is a Mexico 20 Pesos bank note.  This is an issue date of 7/8/1977 with the series CU.  U8303811.  The top serial number does not have the last 1 lined up with the rest of the numbers.   It does have some bending, however it is crisp, so not used that much.

I have recently acquired a very large estate.  There were many jewelry and collectible pieces.  I will be listing many more items in the next several months as I dig thru all the pieces.  Thanks for looking.  Check my other listings for more jewelry, vintage, antiques, collectibles, clothing, fabrics and holiday items.