02-11-2013, 04:43 PM
Sparton used caps like that (not copper though) in their early models like the 931 and 400.
[Image: http://farm4.staticflickr.com/3297/45665...ac2a_z.jpg] [Image: http://farm3.staticflickr.com/2792/41207...ff49_z.jpg]
[Image: http://farm4.staticflickr.com/3297/45665...ac2a_z.jpg] [Image: http://farm3.staticflickr.com/2792/41207...ff49_z.jpg]