Kids bike: Gazelle "Speedy Mouse" 12" (Beckfield YO26)
Would suit age 4-6 ish. 12" wheels. Back-pedal brake (more intuitive for young kids). It's quite heavy but our kids managed fine with it. Doesn't come with stabilisers, so would suit a child who is outgrowing a balance bike and already knows how to balance, or you can probably buy generic stabilisers.
A bit dusty and a few paint chips, but was fully working last time it was ridden (a few years ago), tyres just need pumping up (Woods a.k.a. Dunlop valve, same size as Presta).