This is an exceptional example of a very rare early post war Swiss Model U semi-automatic experimental/prototype rifle serial number "75". It has an all blued metal finish and a beautiful European walnut stock and handguard. This series of rifles was actually developed shortly after WWII when the Swiss Government was evaluating the use of semi-automatic rifles and sniper rifles. One of the models they came up with was this model "U" that used a square bolt design mechanism, with a rear tilting action that was combined with a ten round detachable box magazine and a side mounted sniper scope. This rifle is certainly unique and a clear departure from the standard K31 rifles which used a standard round rotating bolt design. It has the standard side mounted, straight pull type bolt handle that was directly connected to the tilting breechblock. This breechblock is square in shape as noted and is very similar in configuration and operation to the Savage 99 rifle design in that during the cycling action the rear of the breechblock tilts or drops downward to unlock the bolt allowing it to recoil reward. Then during the reloading/cocking action the rear of the breech bolt is pushed up into battery, locking the rear end of the bolt into the rear edge of the receiver. The stock design is similar to the K31, although heavier and more square cross section. It is theorized that this rifle may have been used to develop/evaluate alternate semi-automatic designs for a new sniper rifle. The barrel is fitted with a military style tangent rear sight graduated "1-15" (100-1,500 meters) and a standard fixed front sight with protective ears. The noted "31/42" sniper scope is permanently attached to the left side of the receiver just like the K31 models that were also equipped with the Model 31/42 sniper scope. The scope has the standard inverted "V" aiming point reticle. The top rear section of the action cover is marked: "Schweizerische/Industrie - Gesellschaft/Neuhausen/Mod. U No. 75". The serial number "75" is also found on the rear area of the bolt and extractor. It is fitted with a full length walnut stock and one-piece handguard with finger grooves on the sides that is fitted with two barrel bands and sling swivels mounted on the left side, just like the K31 rifles. It comes with one original box magazine that is marked on the base plate: "SIG/Neuhausen a/Rhr/Mod. U Kal. 7.5/ No 73/12". This excellent rifle includes an original Swiss leather sling.

Excellent with 98% of the original Swiss SIG factory blued finish overall with only minor edge and high spot wear. The stock and handguard are in excellent condition with a nice light color overall showing only minor handling marks in a few areas. A really nice, super scarce, early experimental Swiss Model U semi-automatic sniper rifle.