Weird 10v turbo engine

[Eyvind Spangen]

I checked out the engine in a late '89 200TQ today, and I found the
regular stuff, as dual knock sensors, water cooled turbo etc., but one
thing made me wonder. The engine block was stamped JY, which should be
a mechanical lifter, oil-cooled turbo engine from a mid 80s 200
(Euro), but this engine had hydraulic lifters/head, dual knock sensors
and water cooled turbo. It looked like a late MC or an 1B engine..

What could this be?

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Regards,
ES