I recently made contact with a site that specialises in retro poster mock ups Silverferox. Basically, these are film posters that never existed. It's a fascinating process which provides a harmless alternative to the original official designs issued by the studios. These are designed for non-commercial use, but just for pleasure. Nevertheless, a great deal of skill goes into these designs and for that, they are very admirable.
Here are 6 designs from Dirty Harry and 1 from Magnum Force with the promise of more to come. I look forward to future posters and hope you all enjoy them too.
...and more did come, here are the latest posters (1 additional poster for Dirty Harry and the first for The Enforcer). Great stuff!
Above: Another recent find from the internet, added Feb 26th, 2014