[John V]

So, I decided to open the frame to clean the glass and see what else I might find. Having no experience with these, I was surprised to find the print mounted on a type of cardboard, a little less than 1/8" thick. I was afraid I would be dealing with a thin, fragile poster.
For those of you familiar, would you say this is how they were originally produced, or is the mount from a later time?
Thanks for any help you can provide.
John