Mid 1970's I believe. None of the font matching services are even close. Therefore, I'm thinking it's a custom font. But if you know different, can you please inform me? Would be very much appreciated. TIA.
Our system helps everyday thousands of designers (famous or not) to find the fonts they need to complete their work. Using a database of 990,000 fonts the automatic font finder system identifies the font from images.
Yet sometimes the images are very complex, so other users need a bit of help.
If you recognize the font from the samples posted here don't be shy and help a fellow designer.
If you need help, first try the font finder. At the end of the process if the results are bad you will find a link that lets you post the image to the forum so other users can help you.