Saw this the other week: https://old.reddit.com/r/AustralianCoins/comments/1i4m7cd/do_all_1_cent_coins_have_sd/
I haven't checked any others but looks like a no SD.
Reading that it looks like none of the proof ones have the SD. I can't be bothered digging through the safe looking for the 1978 proof set.
Anyone got their's close to hand?
The PCGS pop report images show the SD.
Its hard to see but its there.
I have a handful and the SD is there but very faint - must have been a trick of the photo because the ones I had to hand could be missed straight on.