JBM Records was a DIY Reggae label. It issued at least one single. 'There Is A Reward' by Aston Gayle (JBM-1). The matrix number of that single, LYN-5445, indicates that the year of its release was 1978, and that pressing was done by Lyntone.  It seems a good bet that the label was owned by the record's producer, Junior Boothe.  Distributed By JBM Records. Thanks to Robert Lyons For The Info.

77 Aston Gale  There Is A Reward  JBM JBM 1