I've seen D's with three and I've seen them with four.
I can't ever recall seeing a GH with four and I've never seen a CH with three.
They are all marked with D for Damascus or DD for Finest Damascus (usually only seen on Grade 5 and higher). Often, but not always, you will see a 3 or 4 stamped above the D which I believe indicates the blade count.
The number stamped closer to the breech end is the grade stamp. I have never seen a 1 or a 2 stamped here... just 3 and higher.
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