Mat­tey was also one of the few man­u­fac­tur­ers will­ing to pro­duce stere­o­scopes on request for a wide vari­ety of stereo for­mats. This is con­sis­tent with a com­pa­ny sup­ply­ing oth­er busi­ness­es rather than sell­ing direct­ly to end users. (from: Stere­oscopy His­to­ry) The 9x12 for­mat, though rarely seen …