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MikeUJoe Merkle created and ran SBC around 1988-1990-ish. The company then ceased. Around 1997, the NGC (Coin Guys) owners thought it would be a good idea to extend to card grading. They then hired Joe Merkle (1998) as an employee based on his past experience with SBC. Some of Joe's better ideas from SBC were used for the SGC brand. Joe lasted just over 1 year at SGC.
SBC and SGC have always been totally different entitites, but due to Merkle, similarities are evident.