Hi Charles,

According to the catalogue "Riche Auswahl" (publication number III/18 211.Lt.1883/55), the Ercona, 6 X 9 folding camera (with mask for 6 X 6), was offered with these options:

110mm/4.5 Novonar, in everset-type Priomat or Junior shutter;

110mm/4.5 Novonar, in Tempor shutter;

105mm/3.5 Yessar, in Tempor shutter.

Hope it is of some help.