went bottle hunting down at the creek today...didnt find any bottles (except a broken alka-seltzer) but i did find this..its about 2 1/2 inches tall..any ideas?
This may not be what it was but it's what it could be now. It's the same idea as below but had an actual lamp base.
It's now a lamp fixture for a bottle. The bottom pushes into the mouth and the wire goes through the hole and out the thread. It looks like standard 3/8 lamp thread and any switch should fit.