This was probably the first series of FED cameras produced at Kharkov after the return from Berdsk, although I have seen it suggested that some may have been assembled at Berdsk. These cameras have a fine pattern on the wind and rewind knobs and brass nuts on the shutter housing. Serial numbers 20xxxx.
Known serial numbers:
200114 (lens: 123548) David Tomlinson
200863 French collector.