This car will only increase in value due to its rarity especially as its configuration is in original Autodelta trim not "add ons"as mentioned above. This 1.5 litre 16V engine had an output of 196 hp which in a 1600 shell is very powerful for the era.I'm sure people do not realise its true value yet. I"ve know of the existence of this car for more than 20 years and it has been hidden away from the public.
I am but an amateur but your post seems to suggest that you are convinced that this is really one of the two prototypes - is this the case?
If it is indeed the real deal, I still find it strange that it appears at auction at the last minute.......