Based on the engravings on the case back, this is a vintage Seiko ladies' cocktail watch manufactured in July 1972.
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Identification Details
Brand: Seiko.
Serial Number: 270224. The first digit (2) indicates the year (1972), and the second digit (7) indicates the month (July).
Model/Movement Number: 11-0340. This refers to the Caliber 11 mechanical movement, which is a manual-winding (hand-wind) movement typically featuring 21 jewels.
Material: WGP BACK ST. STEEL. This stands for White Gold Plated bezel/case with a Stainless Steel back.
Factory Mark: The lightning bolt symbol at the bottom is the logo for the Daini Seikosha factory, one of Seiko's two main historical production divisions.
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Estimated Value
Vintage Seiko ladies' manual-wind watches of this style generally have a modest market value:
Working Condition: Typically ranges from $30 to $100 depending on the specific aesthetic design (e.g., dial color or bracelet type) and overall physical condition.
Exceptional Condition: Rare or "New Old Stock" (NOS) examples with original boxes can occasionally reach $125+.
Note: Since this is a mechanical watch from 1972, its accuracy and longevity depend on whether it has been professionally serviced (cleaned and oiled) recently.