The 2-decks of cards and box are a standard "set up" for poker, still in use today at many poker rooms. Kem made the all-plastic decks of cards -- quite a bit more expensive than paper cards, but necessary in poker games, where the cards are handled more than blackjack, etc. (Gardena, at that time, was poker only -- and nearly always a player-dealt affair.) The copyright 1938 refers to the original date of the design, but I would guess these are late-50's or early 60's. The 2-letter state code (CA vs. Calif.) began in 1963, so it's before that, but sometime post-WWII issue.

The interesting part is the sticker on the box. Note the part of the logo with the knife-fork-spoon. There's a series of Normandie chips with this design on the back. (See chip examples on the Chip Guide.) It's a desirable series, reflecting the time of the food wars among Gardena casinos. Each casino competed with low-price meals in their buffet, in order to get players in the door.

Also note the stamped serial number. Just a hunch, but Normandie may have ordered their cards from the factory like this, as a way to track their decks. Or maybe they put the stickers on them after receiving them ... and inspecting them for any irregularities.

Anyway, an interesting piece of history.

I'm not interested personally, but a Gardena or early-California collector may have interest, especially with the knife-fork-spoon design on the sticker.