Yup, that's an AT91 - at least if it's got the black carbon fibre cantilever. Not really a good choice for a Dual with ULM arm, though - i.e. although the halfinch-mount adaptor and cartridge weight add a good bit of effective mass, that type of ATs nevertheless just are moderately compliant, while high to very high compliance would be more suitable.
Greetings from Munich!
Manfred / lini