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To see these adds please visit , the superb information site by Chris Keene. Castello still occasionally put rhinestones in the mouthpieces, just to maintain it's value as a trademark. I've also seen a couple of pipes with both the white bar and the rhinestone. I don't know when the change was made, but currently, a π symbol is used instead of the 3xx. In the late 1960's and early 1970's the company began the use of the K grading.