It may have been the war memorial building. other than that it may have been the old latheron castle (don't know if it was still intact in the 1870s). I could ask my granny (risking another history lecture) as she lives at Latheron Mains, house built on the grounds of the old castle.
have you tried - http://www.caithness.org/history/lat.../latheron4.htm
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