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There is a long propounded myth that the Singer Company can pinpoint the very day of manufacture of its machines.
Maybe you’ve just acquired some vintage jewelry from a family member or friend.
Prior to the change in the copyright law in 1955, the designs were patented.
The most commonly seen vintage Trifari pieces have signatures from pre-1955 through the 1990s.
Graham Forsdyke worked with the Singer Company directly to remove some of the errors and fix the anomalies in the old chart records, but some have still been found, especially in the post-ET serial number sequences.
Sometimes you might find a rogue 221, for example, in a batch of 50,000 99K machines.That simply means that there were some Featherweights within that group of numbers, but it doesn't indicate with which number the group started or ended or how many 221 machines were involved.