Based on a font identification request over at Typography.guru.
Only |J|Q|Z| are done from scratch, but most letters still needed some interpretation in order to choose what to keep as a detail and what to discard as just an artefact.
As per the samples available, it's just uppercase (plus the lonely lowercase |c|).
It is possible that the original wasn't a pixel font after all, or that the pixels weren't square, and probably it had a higher resolution than 13×13.
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