I don't know the brand but your missing a bolt and special nut that attaches the rear derailleur 'claw' to the dropout.
see that hole next to axle nut? a bolt belongs in there.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk