Unknown Japanese Toy Manufacturer

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Sorry for the somewhat blurry picture...

Does anyone know which Japanese toy manufacturer used what appears to be a stylized "Z" in concentric circles for a logo?

I've seen it twice on toys by Yonezawa - once on a toy itself and once on a different Yonezawa toy's original box.

Here's a photo:

unknown Japanese toy manufacturer

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It looks like the symbol on the Asahitoy Northwest DC-4, but it is not the Asahitoy symbol. Maybe "Dockerills" knows?

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I posted the question on Dockerills site. Fingers crossed!