Vintage speaker gurus needed.

[LuredMaul]

traded out for a few cabs....... the one in question is an old Marshall 2x12 with un marked speakers I'm positive are not original.

The problem they are un marked but have silver dust caps.....
The pics.......
http://i122.photobucket.com/albums/o261/LuredMaul/IMG_2601.jpg
http://i122.photobucket.com/albums/o261/LuredMaul/IMG_2602.jpg

any ideas?