Watch List notes:

British Tokens, Seventeenth Century Tokens, Essex, Chelmsford (2): Tho Haven, farthing, 1669, 3 keys, Locksmith (W.59); Tho Haven, halfpenny, 1669, 3 keys, Locksmith (W.60), both corroded, the first about fine, the second good fine, both extremely rare, an interesting pair (2)
Both from the same obverse die, and neither represented in the Norweb collection.
Estimate: 150-250 GBP