I didn't think the older model was a limited edition but maybe it was.
Some small differences on the dial and bezel from the FB model, and the older came on an aligator strap or bracelet whilst the FB comes in rubber or bracelet, but the main difference is the engraved caseback on the FB model. Which will you be getting? I ordered the FB model through an AD in London, and when I went to pick it up last week, they had one with black subdials waiting for me. They had got the serial numbers mixed up. So I left empty handed. Not easy to come by.
Dean