HI Carlos.
The Premier Mark 11 was made between about 1975 to 1977. The Mark 1 was made from 1964 until the late 1970s. There are a lot more Mark 1s than Mark 11s.
I prefer the Mark 1 but the Mark 11 is interesting as the design was developed and became the Hurricane. Both were very well made and the quality was good.
In UK they cost from about £60 to £70 for an OK one up to about £150 for a perfect one. With a box and accessories they can cost more.
Hope this helps.
Paul.