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This is a 1940’s 18k gold vintage chronograph measuring 36.5mm. The case is a thin but solid 18k gold and the case back is base metal. Often, the thin gold case back that covers this metal piece goes missing as this one has. It does not affect the watch at all as the case back fits snuggly. There are no dings or major scratches on the case. The manual winding chronograph movement was just cleaned and is keep accurate time.