me@my-PC:~$ gpg --list-sig bilbo@shire.org
pub   4096R/19ED3242 2015-08-06 [expires: 2016-08-05]
uid                  Bilbo Baggins <bilbo@shire.org>
sig 3        19ED3242 2015-08-06  Bilbo Baggins <bilbo@shire.org>
sig   L      97F6C54A 2015-08-07  Frodo Baggins <frodo@shire.org>
uid                  [jpeg image of size 13199]
sig 3        19ED3242 2015-08-06  Bilbo Baggins <bilbo@shire.org>
sub   4096R/A182F292 2015-08-06 [expires: 2016-08-05]
sig          19ED3242 2015-08-06  Bilbo Baggins <bilbo@shire.org>