Siku 1:50 Mercedes St John AmbulanceHigh quality, German designed, special New Zealand SIKU 1: 50 scale replica model of a Mercedes Sprinter St John Ambulance. Watch out! Speeding to the incident is this Siku die cast replica 1: 50 scale St John Ambulance. This special New Zealand emergency vehicle is based on a Mercedes square body ambulance with opening doors and removable stretcher. This SIKU model features realistic detailing and is manufactured from die cast metal and plastic