This is a supplement from Shonen Gahou (Boy's Pictorial). It's from around 1966-1967. I believe there aren't many of these left in circulation, considering they were used back then. Magma Ambassador Postcards/Christmas Card/New Year's Card Sonosheet (flexi disc) "Magma Ambassador's Song" I don't have a device to play the sonosheet, so I haven't been able to check the audio condition. Everything is over 60 years old, so please consider this with understanding. Thank you for looking.