George,
Great info! Sooooo, if 81-82 is the pillow side blocks like this.,..... and the land of Aus being sorta Euro in nature.....that date code would be unlike the US dates....where Year Month Day is the rule......but in this case, and for other things Euro......it would appear Day Month Year...or 7th of Feb, 1982 ???
Can't comment on values....other than that perhaps the XE blocks are easier to get down under.....! Shorter boat ride.....
Steve