OK....now...to my inexperienced eye....that lampholder (extreme closeup picture) does look like a kludge.
Can anyone tell me otherwise?
All the pony-cleat receptacles (both bakelite and ceramic) I've run across, the screwshell is integral to the insulating husk - even the ones with a pull-chain switch.
Never seen some half-and-half thing like that...it does seem pointless. Creative...but pointless.
Also, am I alone in thinking that transformers for bells should be in a protective enclosure? I've never been comfortable with those things just nailed directly on a beam like that (first picture).