John, the pressure plate is fixed and the tag under it says "use 220 film only", but, and here is the caveat, there is a gold sticker with red trim that states "start 120 film here" and it is the same type of sticker that is used on the back inner edge that indicates the start point for 220 film.
Thats odd, all the literature I've read (including the Yashica owners manual) all agree that this model Yashica TLR will only accept 220 film, and that the model 12 (brought out one year after the 24)is for 120 only film. Makes me wonder if someone hasn't "modified" this camera to accept 120, or possibly just put a sticker in and it serves no purpose. Every dual film Yashica (and Mamiya TLR) must change the position of the pressure plate to allow for the difference in film/backing thickness.
Those "start mark" tags look to me to have been added by a 3rd party - not the manufacturer. I wonder if the camera has been 3rd party adjusted/modified.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2