Have Not Seen This Before

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I have never seen a set of rolling stock come in a 3 piece Tomy train box like this before. I have seen these cars but on a hanging card/blister type pack. This looks to be first generation Tomy as it has the original Logo and the circus tent. Interesting there isn't a Loco to go with it.

That's because it's released in the 60's

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After some further research it looks like this particular rolling stock set may have been released in the 1970-73 range and what I called the 'circus tent' graphic on the vintage box is actually called the Merry Go Round Mark.