There's that semicircular patch under the chin could be due to anything . I think I have said this before. When I look at my silver bits and pieces they start to tarnish (tone) after a month or so. How a 100 year old coin put away remain bright and shiny without some form of cleaning beats me. A obviously cleaned coin with abrasion marks is certainly devalued however a bright shiny 100 year coin attracts little comment for the most part while a toned coin excite some collectors although this is corrosion silver being attacked by oxygen and sulfur in the atmosphere in exactly the same way as iron and steel rust. Perhaps collectors are too picky with non abrasive cleaning such as Goddards or the Al foil/ bicarbonate methods of cleaning, I have seen coins with very heavy toning come to life with judicious dipping and IMO should not be considered as devalued in some way. Having said that any cleaning should be aproached with caution.
Noonan’s often refer to lots as “may have once been cleaned” which I assume is an arse-covering exercise. However, this coin does have a telltale sign of possible dipping just under Geo’s chin. But it doesn't look blatantly cleaned, I agree.
Bit of a puzzler. The center details of George may have had a bit of dip applied (as opposed to immersion of the whole coin) perhaps with cotton bud or some other device. IMHO these coins need to be seen in hand; doesn't look to be a terrible price though.