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But with 2'000 pieces sold, chances should be quite good to still get one on ebay.

This one finally arrived yesterday:
https://diveintowatches.files.wordpress.com/2015/02/seiko_sbdc027_50th_bracelet_2015.jpg?w=900

Yes, the first one is the Sumo, the one below the Stargate.

And once again, Sumo:

http://diveintowatches.files.wordpress.com/2009/01/seiko_sumo_caseback_open.jpg?w=800&h=487

Speaking of shape:

http://diveintowatches.files.wordpress.com/2007/01/seiko_prospex_diver_200_sumo_profile_2014.jpg?w=800&h=487

...

Sumo:
http://diveintowatches.files.wordpress.com/2009/01/seiko_sumo_front.jpg?w=800&h=487

6105:
http://diveintowatches.files.wordpress.com/2009/01/seiko_diver_6105_front.jpg?w=800&h=487
...