I recently acquired a Hampden KW watch in a VERY dark case. The case is a Fahys SENIOR coin pair case, with a nickel inner unit (except for the pendant, which is silver). A pretty 11j movement which runs. I thought $70 was a reasonable price.

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inner case

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Nice case!, I like silver patina. I just passed up a very patinated sterling case on ebay.

It went for $97 even though the seller couldn't get the covers off.

You did OK considering the ABP on your watch in the Fat Book. I assume you looked your watch up HERE.

Kevin you did very well. The case alone is worth $100 or more in my opinion.

I think it might be worth more if the oxidation and dirt were cleaned off of it.

patina on a hamilton or illinois watch dial - very desirable. patina on silver, not a value adder. clean that case and the 100.00 is very accurate. I love the blue screws, great buy!

Thanks all for the input. I will probably clean it up at some point, but it's soooo black and shiny, like my old mans 1940's Lincoln Zephyr.
I did clean up the last silver case which was an Edgemere "sidewinder". Even the gold was tarnished. A bit of wd-40 and rubbing with paper towel got it clean without removing any of the overlay.

Andy, you say that patina is very desirable on Illinois and Hamilton dials, and adds value, but what do you mean by "patina." I have rarely seen an aged dial that I found attractive. For example, does the dial shown below (on a scarce Illinois Grade 438 movement) have value-enhancing patina? If not, I would be grateful if you posted an example of a patinated dial that is more desirable than one in essentially new condition.