The immense mound of many million broken jars known as Monte Testaccio—still to be seen at the old emporium of Rome—provides in the trade-marks some material not elsewhere available for the study of Roman commerce; and Dressel's publication of many hundred of these marks (CIL xv, 2) deserves the highest praise for the patience expended in their transcription, despite the fact that later scholars have had to correct many of the conclusions that Dressel ventured to draw from them.
Since not a single one of these jars has been discovered unbroken, we must gain our knowledge of the customary items from the fragments of several jars. These items, not always found in the same order, are usually the following :
(1) The potter's trade-mark (usually the initials of the potter's name) was stamped on the handle before the jar was baked. See CIL xv, 2, nos. 2558 ff., for these.
(2) At the foreign customs or shipping office the full jar was marked in bold brush strokes with the weight of the empty jar, the name of the shipper (owner), and the weight of the full jar, thus :
(The shipper usually owned his cargo, hence the genitive form of his name.)
(3) By the side of an inscription of this kind there occurs another in smaller lettering containing a number of items that concern the customs house as well as the shipper—e.g. no. 4366 :
The interpretation is probably as follows (cf. Am. Jour. Phil. 1936, 87 ff.):
‘Received ; Hispalis ; value 20 sest. ; weight 215 lbs. ; from estate of Capito ; export duty : 2 asses; name of clerk; consular date (A.D. 179).’