Antique Hanging Victorian Light Pendant Canopy, Swivel Loop & Stem - Heavy Brass

Antique substantial brass Ceiling Canopy, Swivel Loop & Hanger, and Decorative Stem - all parts I believe belonged to a pendant gas light fixture.  They came together in a box I bought many years ago.  I have no use for ones this heavy-duty.  The weight, size and construction are hallmarks of well-made Victorian lighting... most likely gas.  Components included:  * Ceiling Canopy:  The bell-shaped cap sat flush against the ceiling. It served both a decorative purpose—hiding the functional pipe connections and hole in the plaster—and a structural one by supporting the swivel below.  It is 5-1/4 across the opening and 4.5 tall.  There is a hole in the side of it for a pipe and a set screw in the lip collar on the top. The cross brace shown inside it was in the box, and it fits the stem nipple, so I included it, but I don't believe it to be original construction.  * Swivel Loop & Hanger: This heavy ring allowed the entire lamp to hang straight and move slightly if bumped, which was a critical safety feature to prevent rigid gas pipes from cracking or leaking.  This part is heavy duty welded brass and does not come apart.  * Stem Assembly:  Consists of a 6.5 threaded 1/2 to 9/16 diameter nipple with a decorative sleeve that covers over it.  * Weight: (approx. 1 lb 6.7 oz): This solid brass construction lends it to have been designed for a substantial hanging pendant or library lamp.     See all the pics and study them in zoom.