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Ah, thank you! That helps. I thought it might have been added by the previous owner, but seems that this is just an older board revision. Found a picture from JDW that seems to have the same modification that mine has:

I bought a dead Mac 128k a while ago and now finally getting around to recapping it. It's been pretty straightforward, except for one capacitor. Noticed that someone added a 100ohm resistor on the negative side of the C6 capacitor on the analog board. Was curious if anyone knew what this was for?