Good day,
That is a nice find.
It was not until 1918 that the Swiss were able to begin production, with the first deliveries of Bern manufactured 1906 Parabellums being met in 1919.
My copy of 'The Borchardt Luger Pistols', on page 651, tells me that serial numbers 18751 - 20880 were produced in 1922, so that range includes your Luger.
Stay safe
Richard
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