Exactly.
There is one other modern 270, but I didn't become aware of it until it was no longer sold new - the 270 Computar.
EDIT, for nitpicking completeness: Of course there are others, once one recalls that all of the modern 270's are process lenses. The 270 Gerogons weren't sold in shutter and aren't a direct fit. There's also the 270 Graphic Kowa, though I can't recall ever seeing one of those in shutter. Also in the ballpark, there's the 260 Process-Nikkor and the 260 Hexanon GRII. The Process-Nikkor is specified for a range of 1/2x-2x, and I don't know anything about how it performs at more usual pictorial distances.
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