It has been said that an offer under seal may not be revoked at common law.89 This view, however, is due to a misconception of certain English cases,80 which hold that a deed or contract under seal is binding upon a party from the time it is executed by him with intent to give it effect, although it has not been delivered or communicated to the other party; and being a valid obligation from the time of its execution, it may not be revoked. Such a deed, however, is not a mere offer to become bound, but itself imposes an obligation. The correct doctrine is that an offer under seal, as in the case of offers generally, may be revoked at any time before acceptance.91 Where, however, an offer is accompanied by an agreement under seal to leave it open for a certain length of time, it constitutes an option or refusal, the rules in regard to which are stated below.