1920 Australian Penny

The coin was minted in Australia.
I think you are referring to the origin of the obverse die which is India.

Nah,1920 pennies were Dots,above,below,above and below and 2 dots and no dots.Early days of minting copper in Oz.
Neal Effendi is the expert on this year,if he doesn't see this Thread contact him by PM.

The term "Indian" refers to where the die type was originally used. Both the "London" and "Indian" masters were made in London with the London made first and used for the years 1911-14, 1919, 1920 (some), 1921 (some), 1922 (most), 1923, 1924 (most) 1925, 1926, 1927 (most) 1928, 1929 (most), 1930 (super rare), 1931 (most) and 1932-36.
The "Indian" master was used to prepare 2 masters, one was sent to India and struck the pennies of 1916-18. A clone of this die (plus about 20 partly finished dies) was sent to Melbourne in 1920 and was used for many of the 1920 dated Indians (with slightly more struck by a cloned die made in Melbourne), many of the 1921 dated Indians, about half the 1922 dated Indians and all the 1924 and 1927 dated Indians. A clone of the other "Indian" was sent and used for a small number of 1920 dated Indians, a decent proportion of the 1921 dated Indians and about half the 1922 dated Indians. The 2nd Indian was also used for all Indians from 1929-36. There were also clones of clones which complicates the matter (and can often be spotted by defects such as fishtail/curved base lettering).