I have a spreadsheet with about 60 Michigan breeders. It is not an all inclusive list but I don't see anything that would make sense with "MSAB". I'm guessing that the dog's call name is Skippy but when you register with the AKC you have to have a unique name, so assuming "Skippy" has already been used, it's likely the MSAB part does not refer to the breeder or kennel but the owner that registered the dog. There are no "MSAB" dogs on the pedigree database and Skippy is the only one in the AKC database, so it would be weird for it to be a kennel name if there's only one dog. I believe you have to provide breeder information when you register a dog so you may be able to obtain or purchase this information from the AKC now that you have the registration number.
Liesje & the K9s
Nikon (GSD) U-CH SG SchH1 KKL T1 FO PA TFE-I FDCh-S CL1-R UJJ U-CA HIT TT CGC, free reign semi-retiree
Coke (All-American), couch warmer extraordinaire
Indy (All-American), flyball star in training
Rainbow Bridge Kenya (GSD) U-CH FO OB1 CL1-R CL1-F RA HIT TDI TT CGC