Hi there
I have also been checking around for these old games. They are all Nintendo Game and Watch Panorama models and so far I have seen six of them in my searchings.They are as follows:
1.Popeye
2.Mickey and Donald
3.Donkey Kong Circus
4.Snoopy
5.Donkey Kong Jnr
6.Mario's Bombs Away
I have seen all of these on E-bay at one time or another and they sell anywhere between $10 for a scuffed up and battery cover missing with no box item or right up to two or three hundred for a mint in the box with all parts and papers item.