I'm very interested in this thread as I've been seriously contemplating treating myself to my birth-year red 1680.
However, with prices for decent samples around $7-13k, and with the added uncertainty that I may be spending my hard earned money on a Franken anyways, I'm seriously considering just building my own from a Phong case, NDT dial and ETA(sacrilege!) movement.
Are there any better building blocks to get a decent early 70's red 1680 for under $1500?