Notes: This is the rare streamline version, and Version 1 at that, of this model. Version 1 had small font in the serial number, like this one. Also, the serial number dating is not so accurately know on the Designed by... Perhaps that was the method. Another bit of research to add on these, is that Theo's site claims that the "Great Neck NY" was not on the shank, however, this mouthpiece does have that.
So I do suspect that these models had some love from Mr Brilhart himself and perhaps there are some crossover details between the two versions. 2 Arnold Brilhart "A B Ligature" with the'ST' marking for'Streamline' model. 3 Matching "Arnold Brilhart" Clear Cap that fits this Streamline version. It will not fit a larger/standard tenor mouthpiece. The item "Brilhart AB Ligature, Streamline Designed by, Cap, Tenor SET,'ST', alto" is in sale since Friday, April 19, 2019.
This item is in the category "Musical Instruments & Gear\Wind & Woodwind\Parts & Accessories\Mouthpieces". The seller is "worldwidesaxonline" and is located in Seattle, Washington. This item can be shipped worldwide.