"Most all Royal Doulton has value. There are collectors for most of their works. This appears to be a Mid Century era (1950 - 60's) Cocktail pitcher. Those are also popular with the young people ( 20 and 30 somethings). They generally go more…"
"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…"
"That would be your "Series" or model number. You should be able to find your model name, and approx. date when it was made online.
Just look on ebay.com and try and compare yours to the ones being sold. You could also send an email…"