How to delete key w/ duplicate id?

[Skip Montanaro]

I recently installed GnuPG on my Mac laptop, not realizing it was apparently
installed at some previous time.  After the install I generated a new key
but gave the same id as an earlier key.  My keyring now has three keys:

    % gpg --list-keys
    /Users/skip/.gnupg/pubring.gpg
    ------------------------------
    pub   1024D/D0AA36FE 2001-03-30
    uid                  Skip Montanaro <skip at pobox.com>
    sub   1024g/88676B77 2001-03-30

    pub   1024D/B805F237 2000-04-04
    uid                  Neil Schemenauer <nas at arctrix.com>
    uid                  Neil A. Schemenauer <nas at arctrix.com>
    sub   1536g/90A32543 2000-04-04

    pub   1024D/A5F59887 2005-06-11
    uid                  Skip Montanaro <skip at pobox.com>
    sub   2048g/B2FD262D 2005-06-11

Note that the first and last keys have the same uid.  Everything I've tried
always selects the first item.  How can I select and delete the last item?

Thanks,

-- 
Skip Montanaro
skip at pobox.com