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Kevin is the authority on Rose Co and I have little to add other than finding a Rose Co PC (any PC) is not hard - they are certainly around and Rose Co PCs come up for sale often. However, finding a specific Rose Co PC can be near impossible. As mentioned, Wagner is the most populous and there are only 14 examples on a the combined pop report and some are cross-overs (although I a sure there are some ungraded out there as well).
I love the Rose Co PCs. First, they are gorgeous. Second, they have many of the same Horner pics as the more classic T206, E90-1 and/or CJ cards. Third, the set has so many HOFers - I am not sure any set has more. Fourth, it has a Moonlight Graham, which is perhaps my favorite card. Here are my Rose Co's