Watch List notes:

EGYPT, Alexandria. Aurelian, with Vaballathus. AD 270-275. Potin Tetradrachm (21mm, 9.81 g, 12h). Dated RY 2 of Aurelian & RY 5 of Vaballathus (AD 271/2). Laureate, draped, and cuirassed bust of Aurelian right; L B (date) across field / Laureate, diademed, draped, and cuirassed bust of Vaballathus right; L Є (date) across field. Köln 3063; Dattari (Savio) 5425 corr. (obv. legend); K&G 106.72; Emmett 3914. VF, dark brown patina with touches of green.

Ex Frederick S. Knobloch Collection (Stack's, 1 May 1980), lot 1348 (part of an unphotographed lot containing this coin and an antoninianus. The consignor has the original invoice from the auction, hence the certainty of the provenance.).