I've never heard of them. Based on the driver complement (specifically that large cone tweeter), I wouldn't expect much in the extended high range. Otherwise they look like pretty generic speakers from the era, probably manufactured by the same sort of company that made "house" speakers for the larger audio chains. These manufacturers typically didn't sell anything under their own brand name. It's telling that it's made for Philips, since Philips was making their own speakers as well back then, and it's possible that they were looking for an "economy" series that they felt they couldn't produce profitably themselves.
Some other tells: the midrange cone has a glued join rather than a fully formed cone (although this wasn't uncommon at the time, particularly for lower priced speakers), and the woofer has a pretty small voice coil.
Having said that, you said that you like the looks and sound of them, which is obviously a positive. Do you have any other speakers to compare them to? If so, see how things like snare drums and cymbal crashes sound.