What was this microscope used for?

Discovering rare or unusual microscopes has become almost routine since we began packing the collection, but this one has me (and everyone else who has visited) baffled.

It seems to be a “jug handled” Carl Zeiss Jena microscope from the late 19th/early 20th century. However, it is mounted on its back rather than on a foot (1). Moreover, in place of the usual single condenser, there’s what seems to be 2 lenses of different strengths and 2 condensers (2), hinged so that any of them can be used to light the preparation (3). There’s an additional lens which can swing over the usual ocular (4).

Has anyone any idea what it was used for?

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