That would mirror individual agreements covering 12 non-union workers, and was offered as a last-ditch bid to resolve a dispute which had already disrupted $630 million of pre-Christmas trade and cost the company a contract worth $20 million a year.
Workers would be offered an opportunity to lodge their preferences a month in advance for shifts of between five and 12 hours.
Union president Garry Parsloe said the offer equated to "the minimum rates" included in the individual agreements, but the latest strike notice was in response to letters sent to members' homes threatening to contract out their work if the dispute went on.
"We've never said anything about the money - we will get around to addressing that soon," he told the Herald.
"We've said [to the company] we don't mind you having a fight with us and locking us out, but you stop attacking our families and if you do it again we are going to give you another strike notice, and [Mr Gibson] has done it again."
Told that the company had decided against issuing any more lockout notices, Mr Parsloe said: "We would sooner have him lock us out than send filthy, reprehensible, repugnant literature to our houses."