A lot of history in GPG keyrings...
$ gpg -k
...
pub dsa1024 2003-08-08 [SCA]
5E69659A734629663FBF04EB166C3B2362DBF2F4
uid [ unknown] Hans Reiser (created on laptop) <reiser@namesys.com>
sub elg2048 2003-08-08 [E]
pub dsa1024 2003-12-01 [SCA]
86EFEB4D2AB605B5E3549F69A3F4319719FEDF80
uid [ unknown] Nina Reiser <ninasha@namesys.com>
sub elg2048 2003-12-01 [E]