Not sure if this helps but I bought a Peavy rig in 1981 with 2-15 BW's. Also the next year two of my friends bougt them as well. I still have mine in excellant condition. In that time frame all the BW's I ever seen in any enclosure had shiny bright metal dust covers on them. I never seen one that didn't. They are bright enough you can easily see them through the grille cloth. I may be wrong, but I don't think your speakers are original BW's at least, maybe newer?