chachachachacha

I have the 301 Music Monitor II. Not really the vintage model as yours I guess. Mine is in well-built quality. They were made in Canada.
The direct-reflect technology was quite an innovation that time, it makes the sould more 3-D and layered.

Personally they are good for rock-n-roll and pop music. Not really a good choice for bright sound instruments (harp, acoustic guitar, fife, xylophone) and vocals.