Bobby De La Rue - good to see your examples - similar doubling on top right of the 2d albino block in the auction links.
Osiris, thanks for the links. If anyone wants to experience the earlier auction in sale 229 of the double overprint, the action starts at 5:18 in this video
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*** Edited by Staff to add YouTube tags. Please use them in the future. We prefer embedded video. ***
There is another variety not mentioned here yet. In the notes under the OS overprints in the Stanley Gibbons catalogue it states that varieties exist with the 'O' in 'OS' sideways:
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