I e-mailed these to Lew, and he doesn't know when they're from, except that they're definitely before he moved to Arizona in 1995. He said the computer looks like an early one, so his best guess is 1985-1990. They look like his ads in The Trader Speaks, which ended in 1983, but his ads wouldn't have "SOLD" in them, and he doesn't think he would be selling that much 19th century stuff that early.
Below is Lew's 19th century price guide from the first issue of The Old Judge, February 1985. The prices appear to be in the same ballpark as those on Brian's list, so Brian's guess of 1985 looks pretty good.
