I had the Casino Schloss 500 and was able to add the matching 1000 from David Spragg's table. The scans are approximately 2x actual size as seen on your screen. Info I have is that roulette is currently offered at this German casino but there's no mention of baccarat or chemin de fer, so these were probably roulette plaques.

Located in Berg, Germany. Below is a picture of the place from the web. I'm assuming these are Deutchmark denominated, prior to the adoption of the Euro. At the time the Euro was adopted, DM 1.95583 was equal to €1.

There's a possibility these plaques could have been issued before Saarland became part of Germany in 1957. However, since the 1000 plaque would have been valued at only 8.5 DM, it's unlikely that an expensive B et G plaque would have been used for such a low wager.

A blurb from the WWW says:

Currency Union with the Saarland

The population in the Saar Protectorate rejected in a referendum the proposal to turn it into a "European territory". Despite French pre-referendum claims that a "no" vote would mean that the Saar would remain a French protectorate it in fact resulted in the incorporation of the Saar into the Federal Republic of Germany on January 1, 1957. The new German member state of the Saarland maintained its currency, the Saar franc, which was in a currency union at par with the French franc. On July 9, 1959 the Deutsche Mark replaced the Saar franc at a ratio of 100 Francs = DM 0.8507.