Your AC looks identical to the Kuhlmeister unit installed on my 67 250 SL by the dealer when it was originally purchased in January of 1968. I know some units that looked identical were labeled Frigiking which I think was the company that actually manufactured the Kuhlmeister AC unit. I just had my AC completely reworked and had a new sanden compressor and new condenser installed (I kept all the old parts). Since I'm in Florida this is a must have item for summer driving along with the hardtop. I would be reluctant to remove the AC as it is a value enhancer. It's amazing, down here we put the tops up in the summer and down in the winter, different strokes for different folks.
Mike L.