Likely based on a steam crane of the era.
The model was finished in a red or yellow livery on a grey chassis, mounted on a pair of bogies. Coming with an articulated hook, a wire that was attached to a lever hidden inside the cab which could lift the boom and a ratchet built in to the cab roof would hold it in the raised position.
The crane boom had the 100 tons weight limit moulded in high relief.
The bogies were different castings, the leading one had a pin and the trailing one had a towing slot.