vintage Craftsman tape measure replacement part/flexible rule blade

Vintage Craftsman 10 foot replacement rule blade for a Craftsman tape measure. This is never used in the original box. The tape is white with black and is 1/2" wide. This is marked as a part number 3920 for a 3919 Craftsman flexible rule tape measure.

This is in very nice condition, but there is some pencil marking to the box.