1934 Australian Sixpence
Following the Great Depression and a gap in production for all Australian silver denominations, the Melbourne Mint began striking sixpences again in 1934. 1,024,000 1934-dated sixpences were struck by the Melbourne Mint for circulation, as well as 50 proofs. The comparatively high mintage of proofs was due to the involvement of New Zealand coin dealer Henry George Williams who requested proofs of all denominations in 1934 (Coinworks, https://coinworks.com.au/melbourne-mint). While the proofs were a commercial venture, the Melbourne Mint still struck at least two proofs for institutional collections: two of these pieces are now in the Museum Victoria collection.
Overdates of the 4 over a 3 have also been reported - they are scarce but have not been thoroughly researched.