Old license plates, Washington state

[Ron]

I just completed a restoration on a 1967 C-10. I would like to put 1967 plates on it. The state will allow me to do this but thay must have been issued in 1967. I have several sets of old plates around here and I'll have the numbers run to see when they were issued. I also have some pictures of Washington plates. The confusion is the pictures say "green letters on white background" but they don't say anything about when the word "Washington" is stamped or printed. I know the early 60's plates are stamped, my question is when did they stop stamping and start printing "Washington"? Also, I believe that when the old plates are used that only the rear is required, right? Thanks