I'll qualify my remarks by stating that I do not know if any of the following information is correct. However, I have gathered from many online sources that most, if not all, of Ralph Morgan's mouthpieces are finely crafted copies of several of the most popular vintage mouthpieces of all time. Here's what I've gathered so far, and I hope you all can help me fill in the "blanks" (no pun intended).
Morgan Jazz M - Copy of Florida Otto Link (source: ww&bw review written by a self-labeled pro customer)
Morgan Excalibur EL - Copy of New York Otto Link (source: ww&bw review submitted by a pro musician)
Morgan Excalibur E - ?
Morgan Jazz L - ?
Morgan vintage - ?
Morgan protone - ?
I'm more interested in the first 4 than the last 2, as I think those may be mass produced. But any info would be appreciated.