The case isn't gold filled, it's 20µ electro plate, and if you look at the inside of the lugs and the side of the case there is considerable wear.
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The case tab also shows evidence of moisture in the watch.
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The stem is also badly bent, so a new crown and stem, and possibly a correct crystal should be factored into your total outlay (not to forget the cost of a proper servicing.
If you can live with the case wear it's a pretty watch but as
@hoipolloi said, anything above about $200/$250 is going to put you behind the 8 ball.
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