[Boatanchors] Audio XFMR

[Wilson Lamb]

Family lore has it that this xfmr is from a "Battle Announcing Amplifier".
I doubt it was the portable Beachmaster, because there is a matching pwr xfmr that weighs more than 50 lbs!
Maybe a ship's PA system?
I'll try to post links to it.

https://www.dropbox.com/s/b4idxvtlqz48qlr/Audio%20Xfmr%20%281%29.JPG?dl=0

https://www.dropbox.com/s/b4idxvtlqz48qlr/Audio%20Xfmr%20%281%29.JPG?dl=0

The primary is labeled S,M,F.  Maybe start, middle, finish?  Never seen before.
Secondary is labeled with what look like a series of low impedances, speaker system?

The pwr xfmr is 2900VCT, about a foot square and 8" tall.  Would make at least a KW.

Info appreciated.  
Wilson
W4BOH