Good morning Staff. Firstly, welcome to the club! Well, that is an interesting piece! As you say, we are rather limited by the size of the picture but we can say that the colour configuration (brown/black with white eagle) is correct for a Commander of a Battalion-size signal unit. The normal size of a car pennant is around 24 x 40cm. One possible reason for the size of this pennant is that it could have been used to identify a mobile HQ or command vehicle during manoeuvres. As to originality? as with all cloth, there are certain tests that can be done. Black light, burn test on a loose thread, etc, but only you, having it in hand, have that advantage. Going on the picture supplied, I would say that it has a good chance.