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Question re Junghans 688.10 mov't in a Bund Autavia 73663

Does anyone know if Heuer used manual chronograph movements signed Junghans 688.10 (which I believe is a variation of the Valjoux 7736??) in their manual wind autavias? I found a Heuer Autavia Bund 73663 but when I got a pic of the movement, it was signed Junghans instead of Heuer-Leonidas...could it have been replaced??

Your help is greatly appreciated!

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