Thanks. I first tried some alcohol, since this item was probably used as a dresser jar, and I thought it may have been cosmetics residue, but no luck. I could flake the lacquer off the bottom with my fingernail, but not all the relief. I didn't want to go the solvent route in case it would stain or damage surface of silver.
The annoying part is that this was a powder-puff jar, and could have been polished in less than 2 minutes, so the lacquer (which had yellowed in spots) couldn't have been that big a time saver.
Thanks and happy holidays,