There is a now defunct "authentication company" that was known as Spectrum of Sports. It was GREATLY known to certify forgeries you can still locate items with their COAs such as this
http://www.itsalreadysigned4u.com/sports-memorabilia-Dale-Earnhardt...
The authentication company may have been a cover used by retailers to give the illusion of 3rd party or expert authentication.
The Company is no more...However, it should not be confused with Spectrum Sports Collectibles which is in no way related.
If anyone needs any help with NASCAR items that have Spectrum of Sports coas, Let me know.