The difference between the Generation 1 and Generation 2 Tamagotchi is the game that your little tam plays and the physical background.
The game on the first generation is to guess which way it's going to look. The Gen2 game is a higher/lower number guessing game.
The background on these is a checkerboard pattern. The Gen2's have a wavy background graphic.
This is the Hong Kong Commerative edition Tamagotchi.
It celebrates Hong Kong being handed back to China. ( July 1 1997)
It is some what rare, though not impossible to find. There were 10,000 made.
The one time I played with this, I got "Bill" also known as the "foreigner".
The third row are the first six colors released in the US.
In June of '97
Two of the three rarer colors.
JAL USES "TAMAGOTCH" TOY TO BOOST DOMESTIC FARES
'JAL ORIGINAL TAMAGOTCH PRESENT'
To commemorate the April 1 expansion of Japan Airlines' Mileage Bank (JMB) frequent flier programme to include domestic flight mileage awards to JMB members in Japan, JAL will be offering 30,000 'JAL Original Tamagotch Presents' in a three-month campaign in Japan from April 1 through June 30.
The 'JAL Original Tamagotch Present' has English programmed software in an egg-shaped case bearing the JAL logo.
From April until the end of June, JAL cabin attendants will distribute postcards to passengers on domestic flights for a monthly draw offering 10,000 lucky travellers a chance to win one of the coveted 'tamagotch' presents.
The electronic 'tamagotch' is safe to travel in an airplane but owners of the trendy toy will be requested not to play with it at take-off and landing.
The Japan Airlines Tamagotchi
The white is a first generation.
The orange and black is a second generation. I don't know the story behind the second one.