Many bonsai people have other hobbies. Sometimes they combine those hobbies together such as collecting bonsai-related pins, phone cards etc. I collected stamps since I was a kid, and am interested in bonsai-related stamps and postal items. I also collect old bonsai and penjing postcards, preferably postally used.
Below are my Japanese postcards with bonsai in the pictures; they are about 100 years old and were hand-tinted. Strictly speaking, most of these postcards show Japanese woman activities with bonsai in the background. I have not seen postcard of that period with just bonsai as the main theme. Nevertheless, they allow us to see how Japanese bonsai looked like a hundred years ago.