The acceptance of an offer shall take effect when the expression of acceptance
reaches the offeror.
However, if by virtue of the provisions of the offer, practices or customs established between
the parties, the addressee may, without notice to the offeror, indicate that he accepts by
commencing performance of and act, the acceptance shall then take effect at the time where that
act is performed.
Unofficial translation
Spot-checked
In force from 15 December 2010
Source page 66