The magnetic moments of (double magic 1 1 proton) nuclei having a "jack-knife" j l 2 s configuration form crucial tests for the theoretical treatment of mesonic exchange currents and core polarization effects in finite nuclei. The reported precision measurement and analysis of the magnetic moment of 133 Sb ( 132 Sn 1 one g 7͞2 proton) m 3.00͑1͒m N provides the first such test in mediumheavy nuclei. In addition, new data on the N dependence of the 7͞2 1 1232133 Sb ground state moments are presented. Analysis in terms of particle-core coupling indicates slightly negative collective g factors of heavy Sn core nuclei.

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