Help with identifying Enfield sight

It's a factory rear sight for either an M1917 or P-14 Enfield. The only real difference between them was the M1917 sight was graduated up to 1600yds, and The P-14 sight to 1650yds.
 
Yours looks to be for a M1917 or a P14 as mentioned - will be different markings / different lengths to confirm which it was. The clip, the main slide body and the base ladder part might all have maker marks - "E", "R" or "W". It appears to have had its long range aperture cut off and removed from the slide, which makes that part of it useless. The P14 sight ladder is longer - 2.43"; for the M1917 it is 2.16" long. They will interchange, but sighting ranges will not be correct. The longer P14 one, on an M1917, will interfere with using a charger. Information is from Charles Stratton book, "Pattern 1914 and U.S. Model of 1917".
Another way to differentiate - for a P14, on the top cross bar of the rear sight ladder - on the face that is against the paper as in your picture, there will be the serial number for the rifle that it was installed on. If no serial number, it is likely for an M1917. Numrich (gunpartscorp) in USA showing that P14 rear sight assembly (with complete slide) for $US 30.75 - the small bits are also available separately. They show Out Of Stock for the equivalent complete assembly for a M1917, but do show some parts that go with it - main leaf spring, axle pin, etc. for it, in stock.
 
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Thank you all for the information , it seems it is a M1917 It is ranged to 1600 , no serial number appears , on the back side lower left there are the letters M stacked above an F opposit side is an S Much appreciated.
 
So far as I can find out, originals for M1917 that were made in WWI would have "E" - Eddystone, "R" - Remington or "W" - Winchester. Other contractors were used to produce multiple M1917 parts for the American WWII overhauls - I can not find details of their markings, so an "M over F" and an "S" may very well have been from WWII production for M1917 parts.
 
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