A nearly remarkable new discovery.
Below you will find comparison scans for two Aussie Postage Dues, the 1914 1/2d SG D79 perf 14 x 14.
The stamp at left is from my collection, a nice clean mint hinged copy. The one on the right was acquired today for $5. Can you see the difference?


Unfortunately, rather than a rare new discovery of a sideways watermark previously unheard of, it was viewed by Chris Ceremuga, the 'go to' man for certificates in Australia and pronounced a cut down and reperfed SG D77w. If you look carefully, you can see that the perfs are not quite in alignment and the stamp on the right is much smaller.
Oh well, the search continues for the next find.