From the Oil Panic game (Multi Screen Series), four different promo games have been known so far: «Petro Lewis», «Plessey», «Siteco» and «Stardust».

Now another one has shown up: "Flamagas". This company still exists today. It is located in Spain and mainly engaged in the production of lighters and cigarette paper and it was a distributor for Game&Watch games in Spain, back in the 80's and 90's.

More information can be found in the FAQ about Promo Game&Watch.

Once again, a Promo Game&Watch was discovered. Recently, a Black Jack BJ-60 with the imprinted logo Humpty Dumpty went over the counter on ebay.

Humpty Dumpty is the name for snacks produced by the Canadian company Humpty Dumpty Snack Foods.

Some collectors have doubts if the promo game is real or "produced" by someone who wants just to make cash.

The buyer of the game has stated that he will investigate and he will take a very close look at the logo.

Picture 2 // Picture 3

Auction as PDF

Another promotional Game&Watch appeared. It has the logo of the former computer magazine "Computer Persönlich" from Germany. So far, already three of these promos are known.

Many thanks to Aris for the information!

Another Game&Watch has been discovered carrying the "Plessey" logo.
It’s Oil Panic of the Multi Screen series. It's only known that the former owner received the game in 1982.

Many thanks to Peter for the information and for the pictures!

The game is now also listed in the FAQ about Promo Games.

For years, Game&Watch collectors have been puzzling of what is known as the "cardiogram" logo. The logo is imprinted on a Fire of the Wide Screen series. It’s clear, that the game comes from Great Britain because it carries the CGL logo. So it was suspected that the company with the cardiogram logo should also come from England.

Old Cockpit Panel from a RAF (Royal Air Force) Tornado FighterNow the secret is revealed: It’s the company Plessey from the UK. Plessey was a British, international electronics, defense and telecommunications company founded in 1917. In 1989, it was acquired by a consortium of GEC and Siemens, which split the assets of the Plessey Group.
Quelle und weitere Infos: Wiki

Many thanks to Peter, Aris and Norman for the great hints!

PS: In the Promo FAQ, the Fire is no longer listed as a "cardiogram", but correctly as "Plessey" :)