The scale show two graduations. From 0 to 100 and 0 to 250 gram. The little lever on the right picture, move a second pendulum weight in weighing position for weighing the load up to 250 gram. Unusual but a effective system ! 

Pendulum letter scale

Unusual letter scale, covered in a sheet metal case. The graduation show the weight from 0 to 100 or from 0 to 250 gram. You can change the weighing way with a small slider pin on the top of the case. A little screw move the graduation in the zero position.

This little screw move the graduation to the left or right.

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