mel-trumpet

Hello to the TrumpetMaster Forum,

Although I am not a new member, this is the first time that I am making a posting. Just to get through the background.
I am an amateur trumpet player, doing both concert band and orchestra work. In the distant past I played also in American Army bands. My regular equipment is an old classic "F. E. Olds & Sons Recording Trumpet, from about 1947 or 1950, which I have been playing for a very long time. Truly a great horn. I use several mouthpieces, depending upon the sound that I want to get (these are the most frequently used: 1) and main: A Stork Vacchiano Custom 1.5B+, #26 bore, with a "C" backbore, with a thin rim (this was custom made for me by the Storks) - A wonderful mouthpiece that can be played non-stop; 2) A Schilke #24, a fine very large mouthpiece that I use for a wide-variety of playing situations, including high tone work 3) Stork Vacchiano Custom #1, with a rich warm sound, approaching a cornet sound, but clearly a trumpet mouthpiece.

My question is this: My orchestral conductor gave me a couple of horns to try, later about the C Trumpet. One of them is a Boosey & Hawkes Flugehorn: Special "B" Grade, serial number: 145102. The letters LP are engraved above a logo of a hawk carrying a horn. This flugel seems to be fairly large bore and has a good sound. But it is hard to hold because of the valve arrangement. I have not been able to find much information about what Special "B" grade means.
Can anyone give me some information about this horn, its history, who typically plays a Special "B" Grade flugelhorn and where does this horn fit within the various fine flugelhorns that B&H produced, its bore size and any other useful information?

I thank anyone who as information about this model of flugelhorn.