Clint,
The "in the white" polished area on Swiss lugers indicate that the thumb safety is in the safe (or more accurately...secured) position when you can see the polished area. Germans went to the "gesichert" wording for their guns...and other countries used their word for "safe/secured" as well...
Only a WAG...but since French, German, and Italian is spoken in Switzerland, maybe the folks at the Ordnance boards thought staying with the polished feature made more sense for the M1900 and M1906 and M1906 W+F lugers...
The Swiss did change to a "S" on their M1929 lugers...
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