Reversed mold number on a Ball Ideal

[Trailrunner1974]

Just wondered how common this is. I found this ball ideal a few months back and ever since finding it I check the bottom of everyone I come across. So far this is the only jar ive seen with a reversed number. The number 3 on this jar is flipped. The only way to read it right is to look down through the jar. Have you guys seen this before?

 

[Trailrunner1974]

Heres another shot of the jar. You can see the 3 turned the right way looking through the jar in this pic.

 

[coreya]

This happened once in awhile, probably more so after a hard weekend! [][] I have several in my collection of ideals and many more in the various other jars.