Bored and cleaning out basement and found this one. It is marked 5A with the rest pinpricked out. Remnants of the parallax marking still present. Seems to have the early front mount with pointed screw but rear mount is three point. I also think that the ocular is from an earlier scope. It appears to still be 5X even with the modification and there are no ID markings for who did the modification but it is obviously period. Any comments are appreciated. I have seen others in central Wisconsin.

Thank you,
Charles

Davis, the predecessor to Litschert got its start doing exactly this kind of thing. They made and installed larger objective lenses. They also made ocular doublers and a lens that would halve scope power.

40 Rod

I was guessing it was a Litschert adapter, and maybe an early enough one to be unmarked. Since these were available to the general public to install at home, it's possible some owner just wanted the old markings deleted so it wouldn't be looked at as just another Win. scope.
Many Litschert adapters increased the power rating, and that was one of their selling points.

I think this is a 1930's vintage, "Lyman 5A" rifle scope complete with windage and elevation. Adjustable rear ring and a Litschert magnification. These scopes were  produced from 1929 to 1934.  If you are not familiar with these rings, the small screw in the "corner" of the ring MUST be loosened before turning the micrometer adjustment knobs. Failure to do so can result in damage to the adjustments.  These scopes came with a -- 20x Litschert "Targeteer" Scope Magnifier -- that was installed on this Lyman 5A Scope by the owner.

Here is a bit of history taken from a Gun Digest Article---- 
By 1935, R.A. Litschert of Winchester, Ind., was marketing a series of scope attachments that raised the magnification of several popular hunting scopes, turning them into target or high power varmint scopes. Starting in the mid-1940s, Litschert began offering a line of high quality target scopes. All featured coated optics and 1/4-minute, micrometer-click, adjustable mounts. Parallax adjustment was made by sliding the objective lens in a screw slot rather than by screwing the objective bell in or out on a section of threaded tube.  The buyer had a choice of fine or medium crosswire reticles.  Litschert retired in 1961, selling the business to Myron Davis, who continued to manufacture Litschert's quality scopes as the Davis Optical Company. of Winchester, Indiana

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I bet you're right--since that's the marking on the scope.