Vox Silver Alnico Speaker Score! Now I need some advice

[Scumback Speakers]

Pardon my ignorance, but what does that mean?

27GM is the date code of the speaker (when it was built). More of this old Greenback information here:
http://www.thegearpage.net/board/showth ... adid=67646" onclick="window.open(this.href);return false;