Modulex Mold Types (Part 2: Position Numbers)

There seem to be five different molds:


  • A (1-14) Pat. pend
  • B (1-14) Pat. pend, sometimes erased
  • CA plastic, no markings (not shown, non-production?)


  • Number below third tube (1-8?) Ridge on long side
  • Number between short side and tube (1-20) Ridge on short side

All molds have pip on the short side. Since the pins that make the stud hollows were so small, they often broke off, making a filled-in stud or even a peg on later mold runs.

[Original post and comments on Flickr.]

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