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This is The Lefton Blue Bird series of collectibles. Most pieces originaly came with the famous Lefton red & gold foil sticker, were signed Lefton & numbered. Some pieces were also backstamped ESD ( Enterprise Sales & Distributors, LTD.) a Canadian company allied with Lefton China--they had a joint purchasing operation. (for more details on ESD see my Holt Howard Collectibles Book Second Edition page 50.)
There are a few more pieces to this set not featrued here ( an egg cup and child's bowl). Perhaps there are some very rare pieces that may surface in time, but to date I have not seen any. I believe the most rare piece is the Lefton music box tea pot.
Wow! Awesome Bluebird collection. I have the butter dish, which I inherited from my mother. I just love the Bluebirds. I bet they are beautiful displayed in your home. So happy looking.