Landis & Gyr  "Trivector" polyphase electricity meter to measure MWh, MVAh and MVArh.  New old stock, in manufacturers polystyrene packing that was only just opened to take the photographs shown above.  This is a large meter, about 600 x 470 x 300 in the packing and the weight is around 14Kg.  I'm not sure of the manufacturing  date, but it is at least 30 years old. It is very likely to be in working order, but because of it's age I can't guarantee it.  Being sold as a collectors item, or for experimentation and parts, it is full of precision parts, including some interesting gearing. Wiring diagram is present on the inside of the terminal cover. Not a whole current meter, would require current transformers (and voltage transformers??) to operate as intended. All case and terminal cover screws are unsealed. Would have cost a few thousand pounds back in the day!