Waveguide from AT&T/ Western Electric/ Bell Labs "Long Lines" - 90deg twist

Description

This solid copper/ brass flanged waveguide came from an old 1960's hardened At&t Long Lines/ Western Electric microwave facility. It looks to be in great shape except for a couple of scuffs on the outside with no visible deformation inside. It has a 90 degree twist, is flanged at both ends, one end has a grey flange from old waveguide still attached that I am leaving in place so that the extra screws are included. The flanges have 4 threaded holes and 4 unthreaded.
There are markings that say "ED-50348-70 G1", "CAUTION HANDLE CAREFULLY BUMPS MAY DEFORM TUBING OR FLANGES AND IMPAIR TRANSMISSION", "CTF", "W.E. TEST 110"  and a partly illegible "MECH INSP. 1??"
Please see pics for measurements and info.
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