Zeiss - Carl Zeiss Jena Jenazoom 80-200mm f/4.5-5.6 MC Macro consumer zoom, Olympus OM variant
The 80-200mm MC Macro is the least documented of the Carl Zeiss Jena Jenazoom zooms. UK listings show it mainly in Olympus OM fitting, with Praktica B and Pentax K examples appearing less often, and it is normally sold with the fitted case it shipped in.
A dedicated research pass turned up no catalogue entry for this lens under any designation on any reachable reference site, so no optical formula, filter thread, minimum focus distance or weight is recorded. That absence is the honest state of the record rather than a gap left by carelessness.
It should not be confused with the Contax Carl Zeiss Vario-Sonnar 80-200mm f/4, a genuine Zeiss design in C/Y mount that sells for several times as much and is already catalogued separately. The two share a focal range and a Zeiss name and nothing else that matters to a buyer.
As a budget telephoto zoom of the period it is worth what the glass and mechanics are worth on the day. Check the front and rear elements for haze and fungus, run the zoom through its travel listening for grinding, and confirm the macro setting engages and releases as it should.