Does anyone know how you can distinguish between an L300 or an L300A. Before you say is has been posted, I did see where a technical manual was given as a reference. I am talking about just looking at a pair.

According to the JBL website, the L300 was only made in 1975 and 1976. I have seen 10-15 pair over the past few months on the internet but the foilcal says L300. Does the foilcal read L300A on the L300A? If the foilcal reads L300A, I wonder why I have not seen one with L300A, since should have been many more of these made between 1977 and 1982?

Also, would the foilcal on the mid horn lense be different?

Thanks
Scott