Several hi-res photos of the Don Post Studios Hollywood Horror masks series turned up earlier this year on the Ebay. These beautiful and obscure masks went into production back in 1963, and pre-date the famous "Calendar" mask series. For more info on these check out the Hollywood Horrors Fact Sheet at the Rubber Room.
Don Post Studios - Hollywood Horrors Dracula
Don Post Studios - Hollywood Horrors Phantom of the Opera