Probak double edge razor blade. Made in USA. In 1928 Henry J. Gaisman founded the Probak Corp. as a division of his AutoStrop Safety Razor Co. Probak started to manufacture razors and blades similar to Gillette's. Probak blades would work in both Probak and Gillette razors. Probak razors, however, would not accept Gillette blades. Includes USA shipping.