To find out which version your actual cartridge is (without dumping it), there should be some kind of two or three-character revision serial stamped on the back. Put the cart under a light so that you can see it; it's fairly small.
My cart has an '07'. It is v1.0. If it had '07A', it would be v1.1. If it had '07B', it would be v1.2.
So as you can see, an 'A' means v1.1 and a 'B' means v1.2. No 'A' or 'B' should mean that you have v1.0.