It should also be mentioned that these are also often referred to as Stamp III because of the big K.
In fact, that might even be more common than calling it IIb.
Click here to see a timeline of K Constantinople cymbals.
Constantinople was re-named Istanbul by the Government of Turkey in 1930.
These stamps are the only reliable way to determine the age of the cymbals.
The engraved stamp cannot be erased because it is in the metal.
The telltale feature—the angular shape of the letter “J” in “ZILDJIAN”—is more pronounced in the middle era stamps.
Most other identifying information (stickers, silk screens, ink or grease pencil) fade away and disappear over time.
The date of a cymbal is important because different periods in the evolution of the modern drum set are marked by distinct acoustic potentials.
This stamp is almost identical to IIa except that it has a big K.
The word “Zildjian” is top-aligned with the K, as though it were a superscript.