This is an exceedingly rare model kit of the Russian Alfa Class attack submarine. It was originally produced by a company called Ocean Research and retailed right at the $1000 price point. In 1/50 scale, this impressive model measures out to 64 inches in length with a beam of 7.5 inches. 

You can view a completed model using this hull in my recent Kraken Alfa video, viewable below:
 
Russian Alfa Overview
 
This package includes: 
Fiberglass hull with internal bracing and steel alignment pins
Upgraded, more accurate cast resin appendages
Steel periscope set
Resin periscope head set
High strength nylon scale propeller
 
This model builds into an exceptionally fast and fun model.