The blue lower playfield does indicate early production, yes.
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I don't think it impacts the value. I've had both versions, personally.
The right wireform was modified in future runs with an additional wire to help with balls hopping off it. I didn't have a lot of problems with that in home use with the game properly leveled.
The turbo VUK hole won't 'fit' the cliffy protector, I don't believe, on the early models.
Otherwise, not a whole lot different.
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