Post cards have been made from all kinds of things.
Here are some I have in wood. (let's see some others)
First is an ad for redwood shingles, on a redwood shingle
. This was from the PPIE in 1915 sent to one of my relatives.
Hand cancel is San Francisco, Cal
Not sure where the display/demonstration was setup.
The Sumner Iron Works produced a wide variety of equipment including sawmill, marine, shingle, cannery, and mining machinery. The majority of the plant's work was dedicated to the lumber industry.http://vintagemachinery.org/mfginde....aspx?id=827
Building with redwood was a big deal after the 1906 earthquake and fire.
My mom gave me the Martha's Vineyard. I bought the other in the park.