Redrawing (vectorization) of the first Swiss battalion flag of 1815, after the design of General Niklaus Franz von Bachmann.
Four of these flags were made in 1815, and officially given to the four line battalions formed from soldiers returning from French service on 12 October 1815. 
One of these four original flags is on exhibit in the National Museum in Zurich.
The flag has a sword with laurel in the vertical bar of the cross, and the inscription "Für Vaterland und Ehre" (pro patria et honore) in the horizontal. The inscription is in golden letters. On the reverse side, the flag is inscribed with "Schweizerische Eidgenossenschaft".
See also:

Edi Huber, Ein Glarner gab den Anstoss für die Schweizerfahne (2009)
The redrawing is based on a very low quality photograph of the flag exhibited in the National Museum. Unfortunately, I could not find any depiction of the flag in better quality.
Own work
Dbachmann