Do you have some OpenPGP data and are not sure what to make of it? sq inspect can probably help. It's a like file(1), but specialized for OpenPGP data, and a bit more detailed. It's as simple as:
$ sq inspect file.pgp
https://sequoia-pgp.gitlab.io/sequoia-sq/man/sq-inspect.1.html
If sq inspect does show enough details, sq packet dump might be what you want. It shows information about each OpenPGP packet. Or with the --hex option, it acts like xxd, and shows every single byte as a hex value, and labels it.
https://sequoia-pgp.gitlab.io/sequoia-sq/man/sq-packet-dump.1.html
There's also an online version of the tool:
https://dump.sequoia-pgp.org/
Sequoia PGP