Thanks for the question! You can date the watch by the serial number (you may have an extra number in there, see: http://www.pocketwatchrepair.com/histories/hampden.html) and similar watches are gold plated. Likely if it was gold it would be marked 10K, 14K or 18K as I could not find this exact model in auction databases. In non-working condition the value is likely relatively modest, with other similar watches selling in non-working condition at the $80 to $150 level when accompanied by the original box. If it is actual gold, the value would be more, likely $150 to $250. (Again, the case would be marked).
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