Ambridge memorabilia: cartoon postcards

These five postcards are from the late Louis Vukovcan's collection. Thanks to Jackie Vukovcan for allowing Maria Notarianni to scan them and allowing me to share them here.

These postcards were generic, having nothing to do with Ambridge but the word "Ambridge." The postcard publisher would sell the same postcard in different areas, just insert another location in lieu of  "Ambridge."

I'm not sure when these particular types of cartoon postcards were popular. 1930s? I found similar cards online, but no era was given. Maybe someone with more knowledge of postcards can tell me.