Coworker's RAF wing collection

[mmerc20]

I knew a coworker was a big WWII German collector but we got on the topic of aviation and he mentioned he had a riker mount of full of different RAF wings. 

It was an interesting conversation and he surprised me yesterday when he brought them into work to show off. He has a really nice collection and although most are sweetheart wings, I practically fell in love with the gold pair I have attached a picture of. 

I don't know a lot about RAF insignia being here in the US and didn't realize until recently that the pin-on wings were sweetheart pieces. Being used to US wings, I just assumed both sew-on and pins were used. 

Is there a source for learning more about different sweetheart wings and makers vs scarcity? Without a hallmark, is there any way to know who made the gold set?

Mike

[Tony]

I can't help you with your question but that's a great lot Mike. All I can pick up on is three of them appear to have the Queen's crown.

Is that 20ct on the gold wing? Might that suggest it was made outside of Britain? Apart from having no hallmarks, 20ct isn't standard there.

[mmerc20]

It looks like it says 20. I took a couple different photos because it was hard to see. I couldn't tell if it said 10 or 20. Anywhere else in Europe 20 is more common? France?

[Tony]

I think France has the standard grades of gold like 18 and 22 ct. 

[peter monahan]

I believe Italy also uses the marks '18c, 20c and 22c', with many Italians being rather disdainful of anything less than 20c.