I was watching this auction for a 1963 multi line mahogany brown 500. I would have loved to bid but, I spend enough money on phones this month. I waited until after the auction ended before I posted about it. Anyways, my question is didn't they stop producing this color in the late 50's and the didn't re-introduce it until the 80's? Beautiful phone and I hope it went to a forum member who will post lots of photos!
http://www.ebay.com/itm/Brown-Western-Electric-1963-564HD-500-style-phone-telephone-marked-Bell-and-WE-/161069255602?
EDIT: Sold for $241.38 with 13 bids.
WE discontinued brown (-54) 500s in 1957 but continued making brown multi-line sets until sometime in the 1960s. Brown (-104) and Rust were new Trimline colors.
I doubt that they ever made a brown 564 with square buttons, and upon closer inspection, the seller agreed that this was a later modification to his set. The dial on this set is marked 7D-3 with a 12-63 date. So they took a black dial and added the brown number plate and Lucite finger wheel.
Also, when were square buttons and amphenol plugs standardized? They may coincide with the introduction of the Touch-Tone 1564 and 1565.