Due to the presence of an image for the filling system instructions (in [[:File:1931-10-Catalogue-Boralevi-p13.jpg|this page]] in a [[1931]] catalog) identical to the one used by the [[Helios]] [[Silga]] ([[:File:Helios-Button-Instro.jpg|this one]]) it is possible to assume some connection with the latter. | Due to the presence of an image for the filling system instructions (in [[:File:1931-10-Catalogue-Boralevi-p13.jpg|this page]] in a [[1931]] catalog) identical to the one used by the [[Helios]] [[Silga]] ([[:File:Helios-Button-Instro.jpg|this one]]) it is possible to assume some connection with the latter. |