[John Vasco]

Ed,
They are more than 'interesting exceptions', and not necessarily errors. Whereas nowadays we seek to be hard and fast about things, that was not the case at all at the time.

I have always used 'Bf' when referring to the 109 or 110, but I would not go so far as to insist that that was how official records of the time referenced them.

It's all interesting stuff in the field of research...