NZFF

According to the 1940 Air Ministry Spitfire manual, and backed up by the Ultimate Spitfires book, it's a Type P8 Compass as fitted to the Spitfire, Hurricane, Mosquito and Beaufighter.

Ahh yes, the good old P-8...I knew that....not.
Thanks for the info encyclopedic person, and for your other replies, I didn't mean to screen bomb.

Good heavens...
it floats

They are so old that I think Columbus used one when he sailed to America.

Fantastic detail. Whoever modeled this did their homework.

Thanks for looking gents....this and the other stuff