Sizes of coins
50 Cent (Euro)
Diameter: 24,25 mm
Thickmess 2,38 mm
1 Euro
Diameter 23,25 mm
Thickness: 2,33 mm
both coins fit the standard locks, some even take the 2 Euro coin
US Quarter:
Diameter 24.26 mm (0.955 in)
Thickness 1.75 mm (0.069 in)
Diameter is quite similar to 50 Cent, maybe they will fit, depends on lock tolerances...
UK Pound is:
Diameter 22.5 mm
Thickness 3.15 mm
Thats quite a change in thickness but I wouldnt be surprised if all of those coins fit in the same machines to save in production costs.
I was going to pick one up just to try, but 65EUR is a lot of money! I would probably also need the 10EUR sheath so I dont cut myself when using my keys...
If they are still available around christmas time I might treat myself.