Warm red gold case. This Senator Excellence Perpetual Calendar features an elegant red gold case measuring 42 mm in diameter; its timeless design represents the essence of Glashutte Original in its purest form. Polished and satin-finished surfaces on the case reflect the light in a beautifully complementary manner. A brown Louisiana Alligator leather strap, which is as comfortable as it is stylish, matches the warm tone of the case.