This French postcard is not dated, but from the style of the camera depicted (a folding case with a bellows) I'm guessing that it is from the 1930s. The French text at the bottom of this novelty mechanical card says, "Here is the camera necessary to take your photo." When the attached "lens" is rotated, you see the remains of a pig sticker under the headline of April 1. Note also that there are two fish on each side of the date. In France, April Fool's Day is a long-established tradition marked with some rather strange customs -- such as using fish as messengers of love. When postcards were in the height of their popularity, it was quite common for people to send anonymous, "secret admirer" messages on April 1. Hence, verso, the sender did not sign his name but wrote these enigmatic lines: "Sincerely, anyway, you know I had ? ..... Guess Who."
The card is about 3.5 by 5.5 inches with deckled edges trimmed in teal blue. The background is soft white and it does show stains. The card also has creases at each corner. But it sure is a fun and rare design, especially for the camera buff!