Buzzetti Headset made for Piaggio Vespa Ciao Citta mopeds. You must check your specs before ordering as some vespa models have inverted cups.
This is known to also fit some Honda Hobbit mopeds. It could even be used to mount different forks on your mopeds etc.
Head tube - 25mm x 1mm threading
Bearing cup insert OD - 30mm
Bearing race ID - 27mm