Fed 2 can be found with a serial number prefixed with A, between A003xxx and A09xxxx as it seems. For the moment! Probably because of the range used for the new Fed 3-s.
They all belong to the 2 type d series after JLP: they all have the new speed scale beginning by 1/30th of a second. The first A (n° A003770 for example) have a low level shoe, certainly some old covers previously used. So it's too a transitional model between "c" and "d" types.
All these A types are black.
See classificator by Aidas P at http://www.sovietcams.com/index.php?-1620130885
The lens is the Industar 26m, type F400 or the F410.
Known cameras and lenses:
A003770----------F400-880468----------sold on eBay.
A020539----------F400-494261----------seen on eBay.
A024871----------F410-1039200--------seen on eBay.
A025856----------F410-1031017--------seen on eBay.
A026376----------F410-1002310--------okynek collection.
A028973----------F400-435241----------seen on eBay.
A048771----------F410-1046660--------Michel's collection.
A050847----------F410-1172230--------seen on eBay.
A055765 M.S. collection ( donative inscription )
A078285----------F410-1260371--------Jacques collection.
A096182----------F410-1252217--------seen on eBay.