Study this photo carefully
This course builds upon the foundational knowledge of the various Rickenbacker convertible models that you acquired during your undergraduate studies. These include models such as the 456/12, 336/12, and 366/12.
Let’s begin our discussion by examining a unique topic: this photo of a pair of 366/12's. Who would like to volunteer to explain to the class what we’re looking at here?
Q1: look at the hardware, what's different on these two models (obviously one has the bridge cover removed, that's not what we're getting at). 1 point if you can ID the hardware difference.
Q2: Once we've ID'd the hardware difference - what does the 'different thing' do? 1 point
Q3: Which years had which hardware configuration? 2 points
Q4 (bonus): Did the solid-bodies exhibit this hardware difference also, or just the semi-hollow bodies? 3 points
From @bookrabbitsmith:
The stop is the difference.
From @ronsvintageguitars:
It seems that the stop was introduced in 1967 for the semi-hollow bodied models, although some post-'66 examples appear to be missing the stop, as it could have been removed and/or the comb mechanism is covering the place where the stop should be.