Early Color Lithograph or Pencil Drawing of Mission Delores in San Francisco

I really like this picture. The coloring on it is really nice giving it a dimensional old photographic quality.

My husband picked up this color (lithograph, water color, pencil???) picture of the Mission Delores in San Francisco and it has a signature (in above photo) which looks like Al Wittel or Wettel.

Does anyone know who the artist is or can tell me about this piece. Thanks!

Denise