Seems cheap at current price of $570, although there is almost a day left. Not much in the description and the seller appears to be jewelry dealer. Looks to my untrained eye to be in decent, original condition.
Don't know a lot about Gibsons but if 50578 is the serial number that would place it in 1919, I think.
http://www.ebay.com/itm/Antique-Gibs...item2a556835c8
Al
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