Original U.S. WWI X7.5 Model 1918 Trench Periscope by Wollensak Optical Co. With Leather Case Antique Percussion Firearms which probably explains the great

which probably explains the great condition

This has unfortunately removed the maker mark

the Kaiserliche Marine (Imperial Navy) was reduced in size

with an unclear abbreviation before it

Ammunition Type: Cap & Ball

Original U.S. WWI X7.5 Model 1918 Trench Periscope by Wollensak Optical Co. With Leather Case Antique Percussion Firearms which probably explains the greatOriginal item: Only One Available. Measuring 19 inches in length, this is a very nice WWI Era Model 1918 Battery Commanders periscope. In X 7. 5 power, these were used to help view and plot artillery attacks from behind cover, to avoid exposing the commander to danger. The bottom of the periscope still has the manufacturers markings: TRENCH PERISCOPE NO. 10 X7. 5 MODEL 1918 M. F. G'D BY WOLLENSAK OPT. CO. ROCHESTER, N. Y. U. S. A. No. 4517 R. G. C.