1979 Jim Northrup Card With Signature

This was part of an estate sale auction. While I cannot authenticate the signature I believe it is authentic due to the name on the card (Dick) & the writing on the back discussing when Dick got it. The signature is consistent with those I saw online when researching. The signature is in blue ink. He was with the Baltimore Orioles 1974-1975. This signature would have been after he retired in 1975.