Sociedad Ibero-Americana de la Historia
de la Fotografia Museo Fotográfico y Archivo Historico "Adolfo Alexander"
Fórum Yahoo [maquinas russas]
Used for spy purposes, and discrete picture taking. This ring uses film around the finger, and has a high definition lens.
Frame is advanced by top lever which also cocks the shutter.
Single speed, single diaphragm and fixed focusing. Optical front disguised by front cover.