Something to look for, if you collect this area. A normal 1932-1937 6d stamp has various shades, and you are very lucky if you find an inverted watermark. The example below is frequently overlooked. I have two copies. The key is the Break in the upper frame over "AL".
The normal version is worth about $1 used. The variety shown (ACSC 150d) is worth about $35.
The current price for the 1932 Kookaburra (ACSC 150d) is mint unhinged - $250. Mint lightly hinged - $150. Fine used - $50.
A normal 1932 kokkaburra on cover is worth $50, it is most likely a 150d variety on cover would be a lot more.
The same stamp with an inverted watermark is valued at $10,000.
These prices are from the latest ACSC (Australian Commonwealth Specialists' Catalogue) published in 2015. The ACSC is published every 4 - 5 years if there is enough new entries to be added.
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