Description
Early Example of a Stanley Rule
From my research, I found that these rules were produced in the late 19th-to-Early 20th Century
German Silver trim, collapsing design for easy carrying.
Caliper slide
Marked “No40″
Lovely patina on both sides.
Great overall condition
12″ fully extended + additional 3″ with caliper extended
Measures 12″ L x 5/16″ W open, 3 3/8″ L x 5/8″ W folded, 1/4″ when fully opened.
There is a needle test that may test for ivory, I tried it and it seems to be but not totally sure
The test consists of heating up the point of a needle until it’s red-hot and then pricking what you believe is your ivory carving. If the needle goes in, it’s plastic; if not, it’s probably ivory, or at least bone.
(https://www.google.com/search?q=test+for+ivory&rlz=1C1CHBD_enUS809US809&oq=test+for+ivory&aqs=chrome..69i57j0i512j0i22i30l8.3920j0j7&sourceid=chrome&ie=UTF-8)
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