I don't see much information out there on vintage Marsland speakers used in guitar amps, so I thought I'd put my two cents in. I found a pair of perfect condition Marsland Princess Ten speakers in an old home-built stereo system, so I pulled them and tried them in my Peavey Delta Blues 210 amp. The Princess Tens are 10 inch, 15 watts, 8 ohms, ribbed paper cone with a wizzer cone, light dope, and smallish ceramic magnets. I have to admit I wasn't expecting them to sound like much, but I was actually surprised by their great tone. Compared to the Blue Marvels that came with the amp, the Princesses had less lows, more mids, and similar highs. To me the Blue Marvels seemed like a fairly neutral sounding speaker, but the Princesses had a lot of colour. They have less detail and touch sensitivity than the Weber speakers I have used, but they are still very usable in this regard. The Princesses are kind of reedy, somewhat raw, and really jangly especially with slight blues overdrive. With overdriven sounds they add a bit of fuzz to the mix, probably because of the enhanced treble from the wizzer cones. They have an edgy sound that really cuts through the mix. They sound great paired in the Delta Blues, and the overall tone is enhanced when I plug in my 15 inch Weber Thames extension cab that delivers super rich lows and breathy detail.