Legit eBay seller? ~ khw

[dgo71]

Checking out "khw" on eBay, and he has a ton of old HOF stuff, most all of which is PSA authenticated, but a couple items raised my eyebrow. Specifically, Ernie Lombardi and Cal Hubbard autos that appear to be signed in blue sharpie.
Both men passed in 1977, and while I'm pretty sure sharpies existed then, they definitely weren't widely used and it would seem fairly revolutionary for anyone to have gotten either of these men to sign with one. The majority of the stuff I looked at from this seller looked good, at least to my eye, but these items got me a tad nervous.

Does anyone know anything about the legitimacy of this seller?

Thanks in advance for any insight...hopefully I'll be able to answer a few questions in the near future instead of always posing them....