Letter scales
Pic Letter 87

Very hard to find US letter scale / rule combination.  Patented by G.D.Wyckoff
in 1877


Each end of the rule has a wooden
plug. Both plugs are removable.
One has a clip...
and the other a pin
On the back of the rule is shown a graduation from 1/2 oz to 4 oz. The pin is in use to work as 
weighing point and indicator. Use the pin in the 1 oz hole.... you can weigh a 1 oz letter.





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