This is a pair of McCauley 421 radial horns. They are very similar to JBL 2345, but smaller, designed to be crossed over at 1.2kHz.
They have 1" throats, and are drilled for Altec 2-bolt and also JBL 3-bolt 1" drivers.
Very well made. They were removed from a pair of stage monitors, but would work well in studio monitors or HI-Fi systems as well.
They measure 15.5" wide, 11.5" deep, and 5" high.
I have more in case anyone is interested in a quantity.
I can be reached at (704) 779-1910 or via Asylum Email.