If I remember correctly, you're the British half of the couple, so talking about a UK birth certificate?
My DH's says across the top - 'Certified Copy of an Entry of Birth'. It's an original certified copy - the original is, of course, filed away somewhere else (like the GRO? Not sure.) This is a 'full' birth certificate...
I also have my mother's certified original British birth certificate tucked away some where. Don't remember exactly what it says, but it was easy enough to order it from the GRO online (even from the US, which is where I did it from), so if yours doesn't seem to be a 'full' certificate, you'd probably want to order one up if you need to send it in...