Thanks to all who replied. Ironically, an identical-looking mic popped up on eBay. That one is a Herald M24. Looks absolutely identical to mine save for the Herald label which mine lacks. It also looks a lot like, but not identical to, any of several Astatic and E-V bullet mics. It's eBay # 290527771391 if anyone is interested. 73, Brian KA9EGW