Tom Cederlind on ebay: ex-Billingsgate Nero Dupondius $202.50 Jul-30-01 NERO . 54-68 AD. Brass Dupondius, 30mm (10.42 gm). . R: Victory walking, l. cf. RIC---, Lugdunum mint.. "Tiber patina," VF/EF. An apparently new variant from Lugdunum, ex-Billingsgate. This very coin was published in "The Roman Site At Billingsgate Lorry Park, London" by Guy de la Bedoyere. in "The British Archaeological Report #154" (1986). In Roman times, people dropped coins, including this one, into the Thames River from the original London Bridge, situated near London's old Billingsgate Fishmarket. Such coins were intended to be offerings to the river god..