sounds like you're referring to the rapid cassettes, a system developed by agfa i think in the 1930s. iirc, they would eventually (1950s, i guess?) incorporate a film speed setting feature similar to that used on the later 110 cassette. i've read somewhere that agfa didn't invent rapid cassettes, per se, but rather adapted them from a ansco design. --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list