Allison come to mind instantly. Roy Allison played with some very unique geometries in some of his designs. Be nice if you pulled the drivers, tweeters, crossovers and check for any identifiers such as speaker codes etc.
Ok, the phillips tweeters and shape kind of remind me of some test speakers i spied in the GA Tech audio lab ages ago. It was semi cylindrical section at the top with 4 tweeters and maybe 4 mids. My memory is hazy but it was an attempt to achieve very wide dispersion. certainly no vertical dispersion and i kind of remember the tweeters and mids time aligned, but i may be confusing it eith another stepped three way. the lab was fond of phillips, vifa and eminence though