I honestly have doubts they're Jan Kimberly, as that D-series album predates when Kimberly and other Danish composers that Ole Georg brought on joined the library, being released in 1958 (hence my saying they were the "original" HM). More likely to me it's a currently unknown composer under the prefix whose stuff was replaced with the Kimberly material in the 1970s. "SM" was another prefix that was originally reserved for Alexander Laszlo cues (none of his reels are out there, though) that was later replaced with Robert Ascot material.