Many, many Celestions weigh 10 lbs., including Vintage 30s. Often, speakers without back labels or other markings were OEM in closed-back cabs, because no one was going to see any labels anyway. You'd only get a label in a combo. Mesa did this quite often. No markings at all makes my two-cent guess an Eminence-made. They make a ton of OEM speakers for a lot of manufacturers. FYI, the 200-watt EVM 12L comes in at 19.1 lbs.