Help with thrift store find

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Hi all,

I nabbed a pair of tweeters that were hand labeled "Heil AMT" but have no manufacturer's markings anywhere. I've tried image searches but no luck.

The face plate is 1/4" steel and 3 1/4" x 6 1/2". The membrane looks to be 3/4" x 2 1/2". they measure 6 ohms each.

Anyone have any ideas?
 

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