A much more modern instrument, the "Lemag" LS200 Pressure Indicator is part of a range of instruments produced in Germany by Lehmann &
Michels for the diesel engine industry. The pictured unit was made in the mid 1990's, and was a very unexpected Xmas present! & labelled as "Ruston Diesels".
Lehmann & Michels are still operating, they have a website at: http://www.lemag.de/indicators.0.html
The gauge is oil-filled, standard practice these days.
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