The first Swiss postal regulations divided Switzerland, for the purpose of mailing letters weighing no more than half a lot, into four rayons.
These were defined by the distance or road transport time (whichever was higher) between sender and recipient.
A special, lower rate applied to letters mailed within a municipality.
The stamps depict a bugle atop the Swiss coat of arms.
They are labeled with their denomination and with the corresponding rayon or, as the case may be, as stamps for local mail.