Victorian Pizza Party?

 I picked up this photo in a box of postcards at a sale recently.  I would date the photo to around the turn of the 20th century.  Frankly, the image baffled me.  This jovial group appears to be dining on pizza.  

Here in America, we tend to think of pizza being a product of post-World War II, though it was brought here by Italian immigrants in the early 20th century. It actually dates much further back to Roman times.  Modern pizza has its roots in focaccia and other flat breads topped with vegetables, fruits and cheeses. It evolved into what we know as pizza in Italy between the 16th and 18th centuries.  Descriptions of pizza including it's use of basil, tomatoes and mozzarella cheese date as early as the late 1700's.

There's writing on the back of the photo which appear to include names, but I haven't been able to translate.  "Wiegand" and "Mueller" are decidedly un-Italian.

The smiles and expressions on their faces implies it's quite a treat and novelty.  I wonder what they would think of modern fast food pizza.