4T2 by Ferranti

Rare post coldwar chip fron Ferranti,  no data available ( please call if you know anything). This is one for the collectors.

possibly bloodhound upgarde (rumour- not verified !) 

gold pin flatpack package - see photo. All in superb as new condition as came in original box marked  ....    device type : 4T2 225  (could be 3 or S) date code : 7923