Lyman Scopes

[Larryjk]

I have some older Lyman scopes that I know very little about, except that they seem to be very good quality for their age.
First is a Lyman All American 7/8' tube, 2 1/2x, marked "All-Weather" on the turrent. It has three dots in the reticle; the largest on center and two smaller below in decending size. Just smells of classic.
Second is a Lyman All American 1" tube, 3x, marked Perma Center on the turrent.
The third is a target scope that does not say Lyman. on the eye piece it says "10 Power" and on the adjustable objective it says "Spot-Shot R.A. Litschert". It had been on a Remington Model 37 target when I bought it. It now resides on an original Winchester Low-Wall in .22 K-Hornet.(High comb classic varmint style.
What are the 3 dots in the 7/8" all American? I am assuming 100, 200, and 300 yards in descending order (depending on the caliber).
Tell me anything to better understand the Spot-Shot Litschert.