Thanks for the info. Your stem bears a striking resemblance to the Nitto stoker stem on my Hubbuhubbuh. The stem I got from Grant when he scored a custom stem built by Bernie Mikkelsen. Since my stem attaches to the captain's seatpost (diameter 29.8 mm), your stem cannot possibly serve the same purpose on my Hubbuhubbuh. I was looking for a backup.
Thanks very much for the clarification.
Regards,
Corwin