A late acceptance is nevertheless effective as an acceptance if without undue delay the offeror so informs the offeree or gives notice to that effect.
Civil Code
2015 English source edition · Current applicability not established.
This is the 2015 English-language edition attributed in its front matter to the Ministry of Justice. Eri Atlas has not independently verified the translation, later changes, or whether the text is currently in force. Nine passages are incomplete in the available scan and are identified where they occur.
Article 1348
Late Acceptance. Delay in Transmission · Preserved transcription; page attribution imported from the source collection. Verify against the original.
If a letter or other writing containing a late acceptance shows that it has been sent in such circumstances that if its He transmission had been normal it would have reached the offeror in due time, the late acceptance is effective as an acceptance unless, without undue delay, the offeror informs the offeree that it considers the offer as having lapsed.