The "flying saucer" looks like a foreign object or a drop of blue ink. The "damaged torrent" looks like a piece of foreign material on top or something similar. Anyway, non of these are matching plate flows from Stanley Gibbons catalog. Also, it is hard to tell from your scan. Needs more focus.
, managed to scanned the 6d Gibraltar
in 2400dpi and using the Image Optimizer tool
to highlight the 'Damaged Turret
'. You are correct that The 'flying saucer' appears to be problem during the initial scan. This has disappeared from the 2400dpi scan version.
According to Stanley Gibbon British Commonwealth Catalogue
, the 'Damaged Turret
' variety appears on the Waterlow & Sons
. However Gibraltar
is printed by Bradbury, Wilkinson & Co
and therefore is interesting to see this variety
, probably in the early stage.