I have an etching on marble of the City of San Francisco made in 1975. It is AP /500. I believe this was only one made. It shows many, many scenes of the city blended into one large area. It really is almost a history of the city. It measures 19" 25". There is a signature etched of a John Lohm ????-difficult to read remainder of name. If interested I coujld bring to your gallery for inspection.