This Christmas carols postcard was published by Whitney, probably in the 1920s. The Christmas salt and pepper shakers are probably from the 1950s or 1960s.
The caroling shakers have a silver palette-shaped Napco label with "a Napco Ceramic Japan." The pair of Mr. and Mrs. Santa shakers on the left just have a Japan label. The pair of Mr. and Mrs. Santa shakers on the right are marked "Lefton 1957."