Seeing yellowed old logo salmon Alps Dell AT101s go for around $150 and blue alps Omnikeys go for somewhere above $100 and below $200
I would think that a blue Alps Northgate would be worth a good deal more than an salmon Alps Dell, but I am not really in the market any more.
But I think that you should take jdcarpe's advice: sell it as-is.
Although a certain person might well pay another person $100 to do a restoration job, you should not assume that a restoration job, in and of itself, would raise the market value by $100.
I do agree with all your points here, fohat (I always read your name as foghat, lol
).
Like JD, I'd also rather buy a yellowed or otherwise disheveled keyboard so I can restore it myself. That alone increases
personal value due to the investment and effort made in bringing the board back to a nice condition. Restored boards do tend to get listed for a bit more than unrestored, and while I find that to be pretty justified thanks to the work put in... for anyone who can do it themselves, that's usually work that wasn't asked for, haha.
Here's some crazy examples: I thought this was a salmon alps, but it was actually a
black alps model AT101 that sold for $150.
Meanwhile, we have a likely blue alps
Northgate Omnikey 102 that went for $100.
In the end, I think its hard to set prices on things as they vary so much. I've seen AT101s go for around $150, but there was another recently that went for $100 that was salmon alps and I got mine for $29.99 before shipping. There was that guy who set another 102 Omnikey at $290 BIN but ended up taking a best offer (the price of which is anyone's guess). I think the prices for a lot of these boards are overblown though.