Something/Come Together, Same Label On Both Sides.

I purchased this 45 rpm of Something/Come Together when the two songs were first released. The etchings on each side are the only way to distinguish side one's label from side two. Side 46991 is Come Together and Side 46992 is Something. The numbers are etched on the blank vinyl between the label and the end of the sound tracks. The two identical labels are placed on the 45 with the stem of the apple at 12:oo and 3:00. I love to hear the interesting stories associated with Apple Records. Was this a rare mistake, or was it fairly common for mislabeling to occur with Beatles records?