Top quality bearing made by Nachi (Japan) or similar, size is 20 x 26 x 16mm. This is a FC (full complement) type with more rollers, to handle higher load than the standard Vespa, LML types.
A wiggly front wheel is not a good front wheel, so if yours seems like this, you should be worried. If the needle roller bearing is worn on that front axle replace it with this shiny new one. To suit Vespa PX 80, 125, 150 and PX200 plus clones like Belladonna/Stella, NV SPL models etc and is from an OEM manufacturer.