There is a link on the Alnavco site that gives a pretty detailed history of the evolution of the company and some specifics on the models:

http://www.alnavco.com/pdfs/history_of_superior_models.pdf

Alnavco is pretty much all I buy now as Neptune and other German models tend to be too fragile for wargaming. Their love for never were models rivals mine.

Dave G
The PT Dockyard