What's the difference between these two coins? [solved]

https://en.numista.com/catalogue/pieces20103.html
https://en.numista.com/catalogue/pieces20103.html

Quote: "KrakenTheJaken"​https://en.numista.com/catalogue/pieces20103.html
​https://en.numista.com/catalogue/pieces20103.html

​You posted the same link twice.....

On the reverse there is a dot either side of the date, but not on the coin in your link.
The other coin is (presumably) ...
https://en.numista.com/catalogue/pieces969.html
So the 1966-1973 coins had the dots, and the Set Issue 1973 did not.
Also both 1973 were from different mints. The Set Issue was made at Franklin Mint from
the F letter below obverse, and the coin in your link was made at the Royal Mint with no letter.
Third difference - the large 1 number on the reverse has a pointed base on one coin but not the other; as well as CENT being a different size. The year is different size and shape too.

Summary (for 1973):
KM# 1 1966 to 1973 https://en.numista.com/catalogue/pieces969.html
Obverse: No letter (Royal Mint, U.K.)
Reverse: Flat base 1 number
Reverse: Small CENT lettering
Reverse: A dot each side of year
Reverse: Large year, curves at rim

KM# 17 1973 only https://en.numista.com/catalogue/pieces20103.html
Obverse: Mint letter (Franklin Mint, U.S.A.)
Reverse: Pointed base 1 number
Reverse: Large CENT lettering
Reverse: No dot each side of year
Reverse: Small year, straight across

P.S. I see that two years earlier the KM #1 was made at both mints in 1971.

Thanx, that was the right link!