My collection consists of an IBM 5150 with a 5151 green monochrome monitor and an IBM 5160 with a 5153 color monitor. The 5160 is technically a 3270 but the cards for interfacing with a mainframe are missing and the face plate has been "updated" to reflect that. I acquired them along with a printer and a yellow monochrome RCA monitor and a bunch of manuals in two different Facebook Marketplace purchases:
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