Watch List notes:

Uncertain. Titus & Domitian. As Caesars, AD 69-79 and AD 69-81. AE 18 (17.92 mm, 3.60 g, 7 h). TITTω(sic) KAIΣAPI, Laureate head of Titus left / ΔOMITTIANω(sic) KAIΣAPI, Laureate head of Domitian left. RPC 2813.1. Good VF, areas of roughness, slightly off center. Very Rare, one of three known. 

A similar type in VF sold at CNG (Sale 88, lot 1113) for $300 on a $500 estimate.