I haven't been able to update this for a while because the previous owner of the machine had to send me part of the leg that came loose while moving it. I only got that back a day or 2 ago. Now that it's all together again, I've had a chance to work with it.
First the lid. I took it off and used plastic wrap and masking tape to protect the sides. I put a fair amount of water on the lid, but a lot of it beaded up. I shook some Bar Keeper's Friend onto the lid and scrubbed a bit with a plastic brush, adding a bit of water as I went to make sure the wood was staying wet. (There was some kind of badly applied shellac(?) in a thin coat with very rough brush strokes.) I let that soak and wiped it off and 75% of the stain was gone. Then I did a second treatment, on the stains only, and allowed it to stay on for 15 minutes. I removed it and wiped it down with wet paper towels to remove any remaining chemicals, then wiped it dry and allowed it to dry thoroughly. I sanded it very lightly to remove the last traces of the bad "shellac". Once that was done, I hit it with Howard's Restor-a-Finish in Walnut.
Here's the lid before, and after:
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File comment: Lid before oxalic acid and Howard's
VV100 lid.jpg [ 64.05 KiB | Viewed 283 times ]
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File comment: Lid after treatment
DSCN0757.JPG [ 238.93 KiB | Viewed 283 times ]
The rest of the machine just got hit with Goop and Howard's. Here's the side before and after:
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File comment: Side before Goop and Howard's
VV side.jpg [ 71.57 KiB | Viewed 283 times ]
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File comment: Side after treatment
DSCN0759.JPG [ 238.25 KiB | Viewed 283 times ]
You'll probably comment on the color of the wood darkening from the Howard's, and that's somewhat true, but the photos greatly exaggerate the change. The before pics are in mostly strong natural light and the afters are in room light. I wouldn't say it was like new, but it's a pretty nice machine now.
Thanks again to all who offered comments and assistance.