i signed on to check out the progress of this post and all hell has broken loose. lol. please have a look at the picture below. it is of my gen 091 and my brother's gen 220. you can see that the 220's crown is polished ss, therefor i am quite certain that the 091 is brushed ss, not tt. the reason it looks polished in some pictures is because it is not brushed between the ridges.
other than that, i am 100% sure of my original post above stating that the bezel is brushed ss, the case is tt, the caseback is brushed ss, the lever is tt and the crown guard is brushed ss. also for clarification, the watch rolli posted is a 091 with polished ss accents instead of brushed ss. i have seen this posted on another site and can assure you that the watch did not come like that ... the ss was polished to that finish. kai, i'd love to hear what you are up to? sounds like you are considering building an 091 from scratch. the only issue you are going to have is finding the dial. all the best!