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Short, center-back neck zippers – mostly 1930s-1940s. Coil (plastic) zippers – invented in 1940, but not in common use until the early 1960s.
The zigzag machine was patented in 1873 by Helen Blanchard, but a model for home use, manufactured by Italian company Necchi, was not available to consumers until 1947.
Loops for hanging found inside the neckline of vintage jackets and blouses are usually of European manufacture.Hem tape generally indicates North American manufacture. Circle stitching inside the cups of a bra is a good indicator that it’s from the 1950s. The National Recovery Board was created in 1934, as part of the New Deal. National Labor Relations Act was passed in 1935, so these labels are seen after that date.The first overlock machine (serger) was patented by the Merrow Machine Company in 1889.Some still call all overlock stitches “merrow,” but only a 2- and 3-thread overlock is actually a merrow stitch.The serger has been in use since the 1920s for seam finishing.
This is the overlock or serged finish we still use today on cut fabric edges inside garments.