Help with Henry VII Groat

[Yucksha]

Hello all.

I recently purchased this Henry VII groat very cheaply in auction. It was listed as class IIIc, which I believe to be incorrect. The mintmark is quite clearly an anchor (inverted on obv., upright on rev.) which could only mean then that it is a class IIId (S.2199A). 

This difference is very slight so I wanted to get a second opinion to make sure I didn't miss or overlook anything.

Thanks for any help.

Merry Christmas.