Just been going back over some of my proof and mint sets, mainly 1966 after reading about the silver pattern 50 cent piece in Mcdonalds. It states the Canberra version has 2 eyelashes and the London has a single eyelash. Both the London 50 cent and the 20 cent share the same attributes. That information came from Andrew Crellan. What about the 10's and 5's. Do they have the same similarities with the eyelashes. A double eyelash for the Canberra mint and a single for the London Mint.
In my mint sets there are a London 20 cent piece, gap reverse, and London 10 cent piece, both have the single eyelash, the 10 cent has the 5 spikes on the reverse. The 5 cent is a single eyelash obverse and long spike reverse, London as well. The 50 cent is inconclusive with regards to eyelashes. In my date type sets the Canberra 20 cent, well circulated but has traces of the 2 eyelashes, the 10 cent and 5 cent both have the double eyelashes and correct reverses, (Canberra mints). Same deal with the London minted single eyelashes are present. These are unc coins except for the canberra 20 cent.
1966 proof sets tend to be a bit irregular. I have a 20 cent proof with double eyelash obverse and no gap reverse, (Canberra), 10 cent has double eyelash with what appears to be 5 spikes on the reverse and the 5 cent appears to have a single eyelash and the long spike reverse. It looks like the 10 cent has a Canberra obverse with a London reverse. Can I get some checks on the proof and mint sets, particullarly the 10's and 5's please. See what's out there. I was chasing an unc Canberra 20 cent piece, :) that's what kicked this little project off. Probably just overthought it and totally confused myself again. :)
Pics would be great as well, if it's not to much trouble. :)
I think the London obverse should be the same across all denominations - the distance between the text and rim should also be different but probably also difficult to spot on the 5c and 10c pieces.
I have seen vague references to muled proof 1966 20c pieces somewhere and bought a 5c and 10c proof (both 1966) to check but both were correct so it might only be some. Makes sense as I believe the proofs were struck in 1967 and by then everything was I think being struck with the London reverses.
Thanks Mr T., appreciate it, :) yes the proofs were struck in 67.
Keep us posted anyway - hopefully someone else knows something too.