You could go here for a start:
http://forum.saxontheweb.net/showth...ous-comparing-3-different-era-Buescher-tenors
But just in case that thread is confusing, the short answer is yes and no, depending on which Big B. The bottom line is there are at least two different Big B tenors:
1) An early one with smaller bell flare that is almost identical to a series 1, except for minor things like engraving, key guards, and octave mechanism.
2) A later model Big B, with '156' stamped near the serial number, and a larger bell
flare (the bell itself is not larger, just the flare), with the bell 'kinked' outward. This later Big B is very similar to the 156 with script engraving that followed it.
Those two horns play rather differently. There are some other subtle changes in the Big B during its run.