Glass off we can look into other differences and condition.
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Lots of corrosion and rust.The game looks very low use but was likely stored very poorly over the years.This seems to be very common on these rare prototypes that were held onto by various members of the design team.
Of note the apron art differs in comparision to the production released version.
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The playfield itself shows many differences as well as some rough "on the floor" type changes.These will present the biggest issues to deal with followed by the rust and corrosion.
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