A decent enough example of this rare mark. Only 60,000 ever produced (BCW), divided between PM O and PM Anchor, so few and far between today - roughly the weight of 3 bags of sugar were minted.
Paid around half the price you would for a common variety, so delighted really
Ah, yes, I see what you mean!
I found a template I made up for the portcullises whilst looking out your coin. Very useful for spotting some of the counterfeits.