I wrote:
No actual SSTOs, yet. There have been several SSTO-capable expendable
rocket stages built... The S-IC and the Titan II first stage were
both in the right ballpark... straightforward Atlas and Delta
variants could do it too.

Addendum: And there have been several rediscoveries of the fact that if
you put six or seven SSMEs underneath an ET, even with generous allowances
for things like thrust structure, it makes orbit with about the same
payload as the shuttle.
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