Your willow with the mark you describe was made in Staffordshire c. 1970-1974. The stamped numbers probably refer to the size of the objects. The potteries have their own code for using some of those numbers. We don't provide values on this site, but I think you have a very nice set of good looking, usable willow ware. You can even put it in the dishwasher if you like.
Enjoy!
Connie
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