My RB67 Pro S does have a dark slide holder on the body, left side (non-shutter cocking lever side) above the focus knob. A quick search of the web shows lots of 220 film available. Much of it is frozen/expired but some new/current is also listed. As for frozen/expired, I had purchased a large quantity of rolls of 120 and 220 (both BW and Color) back in my pre-digital days and always froze it. Although I don't use the RB-67 much anymore, it does get occasional use, and I am still using film from my freezer. I do my own film developing and I find no obvious deterioration in quality. I'm talking film with late 1970, early 1980 expiration dates.
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