I got screen shot of this sheet on one of Silvestro's auctions. Loosely translated (courtesy of Google) it says: '' We hereby declare that the car DE TOMASO MANGUSTA is homologated for the transport of 2 people (driver included) as shown in test report n232 / to-68 issued by the Ministry of Transport and Civil Aviation of Turin.''
My assumption would then be that it may have been the 361th car built / the attached sheet would say 232th road tested.