Fed 2 can be found with a serial number prefixed with A, between A02xxxx and A08xxxx as it seems. For the moment, we don't know why...
They all belong to the 2 type d series after JLP: new top cover (higher position of the accessory clip) and new standard of speeds beginning with 1/30th (1/25th previously). But many serial numbers of 2d don't begin with A... All these "A" seem to be black.
The lens is the Industar 26m, type F400 or the F410.
Known cameras and lenses:
A078285---------F410-1260371----------Jacques collection.