It was the time, when it was not so sure, in what direction the size of the watches will go. At least for GP ;-)
When I bought my 7100 Seahawk it came with 38mm (still small for a dive watch). The next Seahawk model had again only 36mm diameter!! but it was only for a very short time in production. (At that time, they called it Seahawk II. A couple of years later, when GP remembered the Seahawk model and released a new Seahawk, they ignored that they branded the last one already Seahawk II. So it became Seahawk II again... ;-)
I guess this is also the reason why yours is only 34mm and why it has just a very small production count. Because the numbers do not represent a limitation. It represents actually the number sold! 
On your model I do not have more information. I guess there is not so much more information available, because there is not so much more to tell about...