Scored an interesting Gruen today. It looks like it is from the mid 1920's, but I have not been able to positively ID it. Couldn't even find it in Mike's new book

I haven't received it yet so I have not been able to have a closer look at the movement.
Gruen jaren 20 zilveren kast voorkant.jpg
but what I know is that it is a 15 jewel Guild caliber. It has a solid silver hinged case.
Gruen jaren 20 zilveren kast uurwerk.jpg
Gruen jaren 20 zilveren kast binnenkant deksel.jpg
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