Watch List notes:

ANCIENT COINS, ROMAN, Mint of Rome unless otherwise stated, Claudius (AD 41-54), Æ Sestertius, countermarked NCAPR in rectangular incuse, laureate head right, rev Spes advancing left (RIC 99); Nero Claudius Drusus (father of Claudius, died 9 BC), Æ Sestertius, countermarked OTHOCP (TH in monogram) in rectangular incuse, head facing left, rev Claudius (or Drusus?) seated left on curule chair, amidst arms (RIC (Claudius) 93). Both fair, the countermarks clear, the second rare. (2)
from the David Sellwood Collection
The countermark NCAPR was probably used during the reign of Nero. It is one of the more commonly seen imperial countermarks. The second countermark, employed during the reign of Otho, is rare.

Estimate: £60-80