Perfins are an entire collecting discipline all their own. Someone on SCF should be able to help you identify them. The first one ending in "B" I suspect is from a bank, but that's only guesswork on my part.
Actually, I just found a perfin in a stack of used stamps from the 1920's and to my surprise, realized that the perfin is for the former Southern Railway Company. Railroad perfins are yet another specialty ... where do I stop with collecting all of these things!?

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The Southern Railway (reporting mark SOU) is a former United States railroad. It was the product of nearly 150 predecessor lines that were combined, reorganized and recombined beginning in the 1830s, formally becoming the Southern Railway in 1894. It was placed under control of the Norfolk Southern Corporation, along with the Norfolk and Western Railway (N&W), in 1982, and was renamed Norfolk Southern Railway in 1990. (The N&W continued to exist as a subsidiary until 1997.)