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Albino double of the Gansu overprint on the Train Unit Issue

You can just see from the scan of the reverse of the stamp (Yang NE69), that there is a second overprint, on the right of the inked overprint (on the left from the front).

The reverse shows a slight 'set off' of the black ink, which allows you to see a difference between the indentation of the printed overprint and that of the un-inked, 'albino' overprint.

The double overprint is clearer when you can hold it at different angles to the light.

Other overprints in this set have a heavy impression, creating an indented overprint.

The indents from the overprints are also visible from the front, but don't show up well on scans.