[Harp-L] Thunderbird Weltmeister

I have a thunderbird Weltmeister in the key of A that is bolted together with six-sided bolts. 

It has an aluminum comb and looks like the reeds are bolted (screwed) to the reed plate.
Coverplate also says: "Master harps since 1947" and "Germany." Is this a Seydel?

What kind of wrench (tool) is needed to open this up?

Thanks for any help.


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