Yes, 75-183 has a brass capped wood tailpiece, as does 76-562. 76-270 doesn't have that one, but it was replaced by a later and taller all brass version.

Now that I look at Peter Lewis' guitar a little closer, it looks like there are four toggle switches.  I saw something like this on 79-1467, which has a CVQ and toggle switch for each pickup.  So maybe it has a Q and a boost switch for each pickup?

Mellow filters are the likely function of the additional switches.

Thank you, Mica