Its not a Bristol or Gloster product (Bulldog and Gladiator are bi-planes, remember, this one is a mono)
If I remember correctly, the prop is metal (I'm at work and the main pic is on my home computer., so I cant confirm until around 16:30 local time. Incidentaly, I took the piccie in the States )
The winner posts the next piccie for us to puzzle over.
Pick a small area .... like I did...of a shot you've taken but not big enough that we see the whole plane, then sit back and watch us squirm trying to figure out what it is.
Prop boss on a Grumman .....one of those things! Not allowed to utter the word or type it, but it's got a feline title, was a naval fighter, used by the US and Britain.