Theoben Rapid Forum

Are there any Rapids marked with "Mark1" like the Mark 2 is?  I read somewhere that after the mark 2 came out they produce a cheaper version or toned down version that they sold along side the mark 2 but referred to it as the mark 1? Can anyone shed any light on this for me?

What would indicate an early mark1, ie made before the Mark 2's and a mark 1 made after the introduction of a mark 2?