USA #CVP98 ERROR: Inverted imprint on Charlie Brown ATM stamp block of 3+1

Description

USA #CVP98 - ERROR - Block of 3+1 (=3x stamps + 1x "Not Valid..." label)
Inverted (upside-down) indicia imprint on Charlie Brown issue
+ regular Block of 3+1 (3x stamps + 1x "Not Valid..." label)
The APC (automated postal center) machines added 3 pieces of information to the pre-printed Charlie Brown design APC stamps from 2015:
1) a barcode
2) a human readable serial number
3) the word "FOREVER".
As a result of the US postal clerk or supervisor inserting the pre-printed Charlie Brown labels into the APC machine upside, when the machine printed the above 3 items, they ended up on top of (technically underneath) the Charlie Brown design instead of the white area on the labels!
This is a very desirable error for the collector of USA error stamps, Charlie Brown / Peanuts subject and/or ATM stamps!
I was the original buyer of these from the APC machine located in Richardson, Texas in December 2015 when this error was available for a couple of days.
You will receive the following:
1) An inverted ERROR block of 3 stamps + 1 "Not Valid..." label (errors are not listed in Scott's)
2) A block of 3 + 1 "Not Valid..."  label (from a different machine and different date); these stamps are listed as Scott #CVP98
(note: I have several of these, so the error & the regular stamp will be from different dates ; the error and the regular stamps were purchased from different machines; only one machine in the Dallas area had the error.  The scan shown is representative of the error & regular stamps that you will receive, only the dates that are part of the vertical serial number will vary).
Shipping is via tracked 1st class or priority mail only within the USA as per eBay guidelines, foreign shipments only via standard airmail sent via the eBay "Global Shipping Center", which will provide tracking & indemnity from the USA to your destination.
--> Reasonable buy-it-now price considering the scarcity!