Matrix / Runout (Side A label): SP 3645
Matrix / Runout (Side B label): SP 3646
Matrix / Runout (A side runout variant 1): SP 3645 RE-2 P2
Matrix / Runout (B side runout variant 1): SP 3646 RE-2 P2
Matrix / Runout (A side runout etched and stamped variant 2 side A): SP 3646 RE 2 M2 -EX MR 18798(4) 4 LH SONIC STERLING
Matrix / Runout (A side runout etched and stamped variant 2 side B): CAT STEVENS SIDE B MII K-6492 LH 2 SON STERLING
Matrix / Runout (A side runout variant 3): SP 3645 RE 2 M2 - EX [Monarch Record Mfg. Co. logo] 18798(4) STERLING 4 LH SONIC
Matrix / Runout (B side runout variant 3): CAT STEVENS SIDE B K-6492 STERLING LH 2 SON
Matrix / Runout (A side runout variant 4): SP 3645 RE 2 SON-2 MII K-6516 STERLING LH SON
Matrix / Runout (B side runout variant 4): SP 3646 RE2 MI 18798-X(4) SONIC STERLING III (M encircled the Monarch Logo)