To establish partial performance, there are a few key requirements. First, there must be an agreement between the parties. Second, one party must have performed part of the agreement. Third, the performance must be substantial. Fourth, the performance must be accepted by the other party.
In this case, Greg sending the 50 watches to Wilton could be considered partial performance. However, since the original agreement was for 100 watches, sending only 50 watches may not be considered substantial performance. Additionally, the acceptance of the performance is crucial for partial performance to be valid. If Wilton did not accept the 50 watches or the partial performance, it may not be enforceable.