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Crystals in Imperial sizes

jdm
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jdm Distinguished Member

jdm

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Posted

I run into high dome acrylic crystals with the following measures. Some are very near and not rounded to the tenth, which isn't common, so I'm thinking these must be made for pocket watches using recurrent imperial sizes? And how did they express these sizes at the time ?

17.8mm
18mm
18.5mm
19mm
19.15mm
19.5mm
20mm
20.2mm
20.5mm
20.85mm
21.4mm
21.42mm
21.45mm
26mm
26.4mm
27.1mm
28.3mm
29.5mm
28.55mm
29.65mm

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