1. Except for zippo in the period of 1942- 1945, there is no notch. Everything else has the word zippo.
1932- 1956 is written in block letters;
1957- 1976 is written in italics;
Since 1977, the trademark modeling of flame pattern has been used.
There are basically thousands of commemorative editions. You can't buy it for hundreds of dollars.
3. As the+year refers to the year when the company was established, this lighter manufacturer was established in 1988. Zippo started at 1932. Obviously does not match.
I hope my answer is helpful to you.