Can someone tell me when Hamilton switched from the "Hamilton Watch Co." signature to just "Hamilton" in script?

I know it is in here somewhere I have seen it but I have been searching for the last half hour and I'm starting to get a headache.

Here are the first two Hamilton pocket watch dial signatures.

"Hamilton Watch Co." in cursive script: 1892 to ~1905

"Hamilton" in cursive script: ~1905 to ~1918 (see picture).


Hamilton Pocket Watch Dial Signatures & Approximate Dates

Thank you very much Ed.