HF drivers and the horns from a pair of 617 duplex. I have never seen a pair taken apart. I have been curious if Altec took a basically off the shelf pair of 802/806 and bonded them on to the 416/515 to make a duplex. I think the 617 is something similar to my 616. 806 HF with something besides 416 as the LF

2 Vintage Altec 617 8A Horns Tweeter Pair with Crossovers | eBay