I have a speaker made by Federal Telegraph co

Hello I have a speaker made by the Federal Telegraph Co. with what I believe to be an 18" Jensen field coil woofer and tweeter. I am having a hard time finding out any info on this. I know it's extremely rare. I would love to get a ballpark figure on its worth. I have seen the 18" speaker sold for upwards of $6,000 dollars on ebay.  That's without the tweeter or the cabinet. I guess what I need is an expert on these types of speakers. I have photos of the speaker but I have no idea how to upload them to this site sorry. Any information will be much appreciated.