The 507 '57?
Then you mean Lindgruen, which is a kind of pale green, not minty looking. And the car is 85,000.
Staying in the BMW dealership, there's the BMW M Coupe '98, it comes in Evergreen, which is a dark mint colour. Worth a look.
In the Mercedes-Benz dealership, there's the 300 SL Coupe '54, it comes in Perlmuttgrun which is a green by name, it looks minty to me.
From the Volkswagen dealership, try the New Beetle 2.0 '00 in Cybergreen Metallic or the Lupo1.4 '02 in Fantasiagrun. Also the 1200 '66 comes in Java Green and Bahama Blue.
Look in the Triump dealership, the Spitfire 1500 '74 comes in Java, which is pretty close to my idea of Mint Green.
And over in America because I didn't think of checking Japan, Plymouth AAR Cuda 340 Six Barrel '70 in Frosted Teal Metallic.
Worth checking these above ones out and letting us know if any are close to what you think is minty green.