Before and After: This is a Kanstul Fullerton Trumpet.  It was made when Zig Kanstul opened his own factory in Fullerton after leaving Olds, Benge and King, and I think just before his collaboration with Besson on the Marvin Stamm and Meha models. I put this in the late 80's or early 90's. It has a low serial number. Everything about this horn demonstrates a high level craftsmanship and quality from the nickel-silver outer slides to the valve compression to the high-precision assembly.  It is a ML bore (.460") with a .349" leadpipe venturi.  At that point in time, Zig had acquired a lot of classic bell mandrels and the one used for this horn is so sweet. The bell taper is slow to a 5" bell which, in combination with the large leadpipe venturi, provides a compact core with crazy-nice sprinkles of overtones. This horn is one of the most efficient playing horns I have experienced.

It comes equipped with Jason Harrelson's VGR (Venturi Gap Receiver) system. The VGR allows the player to adjust the venturi gap with different mouthpieces in order to change the playing characteristics of the horn. With the VGR the mouthpiece gap can be adjusted from zero gap up to .180", in .020" increments with the provided sleeves, allowing for a range of shallow to deep slotting while creating ranges of resistance feel to the blow.This horn's production was overseen by one of the great master trumpet builders and it plays that way. If you don't like it, send it back within the shop policy period.