Below is a list of categories developed to assist in ranking the availability of a given piece. This rating will serve as a benchmark for new collectors and dealers to assist them in determining how common or rare a piece may be, ie A – Common Production Piece versus D – Rare Production Piece. Not all items fall neatly into one of these defined groups. For those pieces I have assigned a hyphenated rating that spans two groups. For example, the #511 Gonder Imperial Modern Swan Vase has been given an A-B rating. Please note, these are high level guidelines and your collecting experience may differ.
Also, I have observed that when rare items come to market and sell for a good price (such as on eBay), it will often spark an interest from dealers who will then list the same item hoping it will also produce a good sale. We may go months or years without seeing a particular item, and then see several of them listed and/or sold in quick succession. In my opinion, that doesn’t change the availability of the item, it just brings them to market at nearly the same time. Once the flurry of activity has ceased, it may be months or years before we see that item again!