Both types the new softeware error on the left side, the right is when the paper is feed into the machine upside down. Full set of both Machin from a London NCR machin all the set is upside down. The new error is from Nov 2016 the paper feed error April 2015.
Any marks are just the scanner. Both will have copies of the receipts Easy to tell any difference the software error will have Worldwide 100 as the top stamp which will never ever happen normally. This item is in the category "Stamps\Great Britain\Elizabeth II\Decimal (1971-Now)".backler" and is located in this country: GB.
This item can be shipped worldwide.