have a read of this, page-12

I'm keeping mine all polished up and sitting in proper coin books. There will come a day.......

Cleaned up - they look good.

These are the silver content values:
Coiins AG USD AUD
1910-44 3d 0.0419 $0.66 $0.74
1947-1964 3d 0.0227 $0.36 $0.40
1910-1945 6d 0.0839 $1.31 $1.48
1946-1963 6d 0.0453 $0.71 $0.80
1910-44 1s 0.168 $2.63 $2.96
1946-1963 1s 0.0908 $1.42 $1.60
1910-1945 Florin 0.3364 $5.27 $5.92
1946-1963 Florin 0.1818 $2.85 $3.20
1966 50c 0.3416 $5.35 $6.01

http://www.australian-threepence.com/silver-coin-values/australian-silver-coin-values.htm

Some dates are special mintings which increases their value as collectibles