Since time is of the essence for the charity auction - I'm answering this out of order, so I hope nobody is too upset.
Here's what is in the scant file:
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13-72 Garcia
Dub Guitar
top: Walnut
back: Walnut
body: Mahogany
neck: Mahogany and Walnut
Prototype monofilter
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The file is a 3x5 card with details written on it, now stapled in a file jacket. There are no additional notes in the file.
I interpret the Dub Guitar as Double Cutaway Guitar but I have no other reference to back that up.
My dad looked at the pictures of the electronics with me. It seems like there were things done in 2 stages, based on the connections themselves, and the drilling pattern. Here's a roadmap of what we're thinking the controls are based on the photos you supplied:
We think the original controls did not include the filter frequency and damping (and probably the master). Originally, the filter and Q controls were probably where the volume controls were, and where the volume control are now is likely where the tone controls were originally.
When time came to install the filter and Q, some new drilling took place. I can't say if the installation was done here or not, as there is no records, but it wasn't like we kept a journal. By the looks of the circuit, the filter has a pretty narrow range, and a Superfilter box was probably used to determine the range values.
So while we installed Superfilters in instruments predating this guitar, this is the earliest one I can find that has the filters wired to be on all the time, like we use now. The records may show something else later, but that's what I can say from what's before me at this time.
There's no indication if the guitar was made for Garcia or he bought it. Many of the instruments made for the Dead were ordered by them, but not with a strict spec sheet like is more common today.
Hope that helps!