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33.02 cm? what is size
These would most likely be worker, batch and design/shape numbers. This should be all they may need to narrow down when the item was made. From the producers point of view, they would want to track down this information if quality control issues arise. From a collectors point of view, certain items in a specific production run have more value than others.
A collector of these bowls may be able to provide more elaborate explanations of the specific number sets for you, failing that, contacting Emile Henry would be your next best bet. They will most likely not be able to value the items for you, as they produce them, not collect them, but they would be able to provide the true meaning of those numbers for you.