British WW1 1917 Vickers Ltd / W. Ottway & Co Ltd Ealing (London) No.17 Artillery Gun Or Mortar Optical Sight

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This WW1 black painted brass instrument is for artillery guns and mortars. It is in excellent condition - still has leather eyepiece shade. The instrument which measures 5½” overall length is fully functional and has  manufacturer marks and designation(all illustrated).  The instrument retains its original black paint finish. Offers?