Dirk van Erp lamp, from my brother-in-law's estate. He bought it at an antique store in San Francisco in the 1960s. It does not have the windmill stamp on the bottom, so it might have been made before 1910. Three of the 24 tabs that hold the mica shade in place are missing, but this is only visible on the underside of the shade. Thank you very much for your help.
Copper base and a shade made from copper and mica.
This lamp does not have the usual windmill mark on the bottom, which may mean that it was made before 1910.
Size and dimensions of this item
20.5 inches tall by 15 inches wide by 14 inches deep.
Bought at an antique store in San Francisco, California in the 1960s.