That's one of the vintage Tamagotchis, Mesu! Quick info below, from Mimitchi.com of course:
Osutchi & Mesutchi, (aka. Mateable Tamagotchi and Wedding Tamagotchi) was released in Japan about December 20th, 1997. They were released in 6 different styles, 3 Mesutchi and 3 Osutchi. Each with a color coded and matched styled pair.[...]. These Tamagotchi you can raise until they are adults, and if compatible, when linked up they will mate and have children.
I'd say go for it if it's cheap, they rarely are these days. However, you would also need the male, Osu, to fully enjoy and experience the Tamagotchi.
Hope that helps,