This is a gorgeous Schilke B1LB in gold plate in excellent condition! There are signs of a dent that was removed on the main tuning slide, otherwise, immaculate!
 
From Schilke:
 
B1LB – ML Bore – (.460”/11.68mm) / L Bell – (5”/127.00mm) "Beryllium" Tuning Bell with #1 Taper
Acclaimed for its exceptional intonation, ease in response, and outstanding projection, the Renold O. Schilke designed Bb trumpet has set the standard for playability and build quality since it was introduced in 1956.  The classic reverse main tuning slide with full radius bend, mouthpipe design and bore variation help create a responsive, open feel with an overall evenness throughout the range of the instrument at all dynamic levels.  This characteristic design is streamlined, clean and elegant.  The B and X models provide a balanced, comfortable playing experience with a superior tone quality.
Medium-large bore
Large throat bell
Key: Bb Bore: .460-inch (11.68mm)
Leadpipe: Reverse taper
Leadpipe Material: Yellow brass
Bell: 5-inch (127mm) large throat with #1 taper in fixed or tunable design
Bell Material: Yellow brass
Valves: Monel
1st Valve Slide Adjustment: Thumb saddle
3rd Valve Slide Adjustment: Fixed ring
The B1 was the preferred Bb trumpet of the legendary Renold O. Schilke and is the basis in design for the other B & X Series instruments. Distinguished by its free and open feel, this trumpet is among the most popular Schilke models, allowing the player the diversity in sound color from a rich, full bodied dark sound to a brilliant ringing tone when desired.