Looks just like my 85 EURO 500. The euro didn't have the electronic ICV but instead had a heat activated ICV which is what you have. Look on the block just behind the left (Drivers side) head. You should find a number like 117.963 or 117.961 followed by some other numbers which I think is a serial number. The 117.963 is the US version and the 117.961 is the EURO version.
I have a US car with a EURO engine which I converted to the US ICV system and it works well.

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84 500 SEL (307,xxx miles)