Correction! Apparently a Junior Six-20. The film sticker inside says, "620" and the spool is a 620 spool. So I go to find the box (in a closet and not in the display case) and sure enough, Six-20. Anyway, the finder is still the same as in OP.
Sadly, when I opened up my "new", never-used camera I found little black strips inside that came off the bellows. So unfortunate because it's beyond clean and shiny otherwise; unused.
Not sure why the black felt(?) liner slats came off. The only time this camera experienced warm, humid conditions was the just-over 2 years I spent in New Mexico. Yes, NM has very low humidity, outdoors. However, we had a swamp-cooler on our house to keep temps bearable during summer. Swamp coolers are notorious for pumping humid air into the house (but appreciably cooler than the outside air). I know some RFFers here are also NM alumni, and probably know all about that.
Funny that during Fall, Winter, Spring, when we don't run the swamp cooler, the ambient relative humidity both inside/outside the house is very low. Wood furniture takes a terrible beating. We had (still have) a desk that would crack right down the middle of the top every late fall/early winter as the wood dried out in the low humidity. During summer it would miraculously "heal" when the wood reabsorbed moisture from the air (that darn swamp cooler). Never had such stress on the furniture in any other place we've lived -- Bozeman MT (my favorite), northern CA, Puget Sound/San Juans, and western Oregon, only NM had such extreme low humidity. Such an awful place. Nobody should bother going there. It's awful and you'll hate it. Be sure to tell all your friends and family too. They'll hate NM and would much prefer Florida, South Carolina or even Hawaii. But no need to visit NM 😗🤐