Looks like (-half-) the casting mold for a toy or candy called 'space robot'. There is a green cast on sale on Ebay with striking resemblance. Must be from the '50s or '60s by the looks of it. MSI Museum of Science & Industry Chicago Illinois might have a complete one of these.

that is a mold for a die casting machine. this is the cover half since it has no ejection system. could be for plastic or aluminum possibly. usually plastic molds are highly polished

References:

I'm a die assembler

Reason:
thank you, can you be more specific what character it is?

Robot Mold

References:

None

Reason:
Thank you for your opinion, but we know it's a robot mold. We need to know what character it could have been used for or what it goes to.

Looks like (-half-) the casting mold for a toy or candy called 'space robot'. There is a green cast on sale on Ebay with striking resemblance. Must be from the '50s or '60s by the looks of it. MSI Museum of Science & Industry Chicago Illinois might have a complete one of these.

References:

http://www.ebay.com/itm/Mold-A-Rama-Green-Space-Robot-MSI-Museum-of-Science-I...

http://www.msichicago.org/visit-the-museum/museum-info/ (They might have more...