I think this is an Argentinian airline operating under lease to Air Bridge.  One of a fleet of turbo-props and piston aircraft that used to day-stop in MAN for the express courier companies before they cororatised their own fleets.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/130275500@N02/23466024593/">STAF Electra -OGST at MAN</a>