A date for serial number 128xxx would be?
Middle of the 20s ,, is my Guess. 1925-26? (more) help will arrive to your thread, We love the Winchesters. Personally I struggle with an O-sea-D disorder BECAUSE of them.
She "should be wearing round top (beautiful) wood stockings! with diamonds!
VALUE
Serial Number and Caliber make your pistol desirable to Many but you've provided no photos.
The difference between Good & Very Good is where the spread of my price range originates.
My opinion of a Very Good Winchester Model would be 7-$850 the same pistol in Good 5-$600.
IF by chance,, your Winchester is equipped with Target Sights. $3000 probably wouldn't be out of the realm of reality.