Australia KGV Head Stamp SG77w 1½d Scarlet, watermark inverted
SG616aWi 4d Dark Ultramarine 1960 Phosphor Issue with 2 Bands Inverted Watermark Wilding Stamps
4543: GB SG462wi Inverted Watermark Set of 5. 1937. Mi198Z Used. C£125 – Blackheath Stamps
Error Note Chronicles: Watermark Errors | PMG
SG370aw 1921 2d. Orange Die II. Inverted watermark. Superb unmounted pane. Fresh and scarce. Spec NB11a.
Great Britain 1935 SG455Wi 1½d King George V Silver Jubilee, inverted watermark
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SG218wi ½d yellowish green watermark inverted
U.S. Scott 264 used inverted Watermark | United States, General Issue Stamp / HipStamp
Sg 205wi 4d Green & Purple Brown INVERTED WATERMARK | Andrew Vaughan Philatelics
GB QV EMBOSSED Stamp SG60wi 6d Purple WATERMARK INVERTED Used Cat £1,000 BLRED22 - Samwells Postal History
AUSTRALIA: KGV Heads - Single Watermark: 1d Red Rough Paper Perf 'OS' Die II INVERTED WATERMARK, small-part gum; BW. 72bb(a)i- extrapolated Cat. $1300 .
Inverted watermark' - what does that mean? - STAMPBOARDS - Postage Stamp Chat Board and Stamp Forum
GB QEII Wilding 1954 2d Red Brown SG518wi Inverted Watermark Used | eBay
1967 Discovery & Invention. UM marginal single WATERMARK INVERTED. SG 754Wi.
4543: GB SG462wi Inverted Watermark Set of 5. 1937. Mi198Z Used. C£125 – Blackheath Stamps
Sg 439-449wi Set of 3 WATERMARK INVERTED UNMOUNTED MINT | Andrew Vaughan Philatelics