There were many molds with the mold pip on the short side with a flowrib. The mold letters were used several times, so sorting can be a challenge. This mold is easy to separate: the mold numbers are scratched.
Some of the molds were made reusing elements of older molds. There are remnants of an old mold number below the flowrib.
We might be able to identify the mold that supplied part of this mold. The “pend” mark is upside down.
Humans make errors. Luckily, no one will notice small mistakes made in mold numbers… Just cross out the error and try again.