Here is the 1980 Victa Utility for comparison WM151AO ,Cylinder head no.470 Engine number starts with 470
My Mayfair Utility Cylinder Head no. 260 . Engine No.02000941 that 0 after the 2 in the engine number was half a zero so it most likely is a 6. Engine Number 02600941
I will have to check that Commodore number again it looks like the head code numbers are the same as the start of the engine numbers.
A few of the numbers are poorly stamped making them difficult to read.
The Super Start sticker on the Utility gives it away that the engine has pointless ignition.
Just picked up this 1980 Utility today, it's just a tad rusty.