I would say that I sort of collect oil-can delays, though at the moment, I have a collection of "dead" ones and one stellar sounding working one.

Tel-Ray is the company that invented the "Adineko" oil can echo technology, which they sold under their own name, and licensed to Fender (the Echo-Reverb, Dimension IV, etc), Gibson, Rickenbacker, etc.
Tel-Ray became Morley and continued to offer pedals with the technology until BBD analog delay chips became affordable.
My working unit is a Tel-Ray Super Organ Tone, which has the fluttery, dull sounding echo with a wobbly vibrato. It is one of my favorite effects.
I also have a Morely echo pedal (which looks like the rotating wah as well) and another Organ Tone, and a Fender Echo-Reverb which all need new oil, which is not as carcinogenic as we used to think.
Read R.G's awesome explanation of the oil-can delay.
Roger