Nice1951 London Half Penny. Opinions Please

I found this in the 'Blue Sheet':

In 1951 The Royal Mint London produced 40 million sixpence for Australia distinguished from the 1951 Melbourne mint sixpence (Learn more about the 1951 Sixpence) by the mintmark PL, abbreviated from pecunia londīniī (money of London) or percussa londīniō (struck at London).

I can't comment on the accuracy or otherwise of it though.

One thing with the 1951 PL Halfpenny is that the definition is so crisp that you can spot it is a PL over the Y. (Perth) or normal (Melbourne) just by a simple glance. The PL has crisp hairlines & details all over it.
A pity about the slight rim damage & a few little marks, I'd also be saying gVF to aEF.

Thank you all for the help and info.
When I was researching mint marks yesterday I was reading an article about how during certain years, (i forget which, Information overload lol) in order to save money dies were often reused/repaired and sometimes faults were fixed by re punching out certain details by hand, especially date numbers making for inconsistencies in orientation and also spacings. I thought this must make it even harder to pick out fakes!