K&E (KEUFFEL & ESSER) DORIC JUPITER DRAFTING SET

#9406B model number. Very clean, obviously used very little. Circa 1955-62. case: green leather grained cloth, 10 1/4" long, 4 7/8" wide, 7/8" thick. Overlapping flaps w/ snap closures. Fitted interior lined with green velvet. Flat design, Chrome plated (plating in excellent condition). Most major parts marked "K&E, Germany. Exterior case is stamped "K&E (Logo) Doric Jupiter 9406B". The 4 digit product number and old style flapped case (v.s. the hard hinged case introduced in the 60s) makes this piece likely to be from the late 50s.