Limited- by announced quantity, with each item numbered. Limited- by announced quantity, with items not numbered.
Limited- by announced firing period, numbered or not numbered.
Limited- by year of issue, restricting the quantity to the number produced during the year of issue.
Limited -by an announced time period which may be more or less than one year
A Checklist For Buyers
Maker — does the item's manufacturer have a reputation for quality and fine workmanship?
Artistry — is the subject one of broad, but not trite, appeal?
Limitation — is the edition limited, yet not so limited that it cannot penetrate the market? If the edition is closed, are the dealers bidding in the secondary market?
Commemorative importance — does the item commemorate a seasonal event or an historic event?