Comment by Mike Gann:
Thank you. I have reversed the track order.
Comment by cyeaman SUBS:
Talking Machine World frequently listed the L side above the R side. This is why I don't trust their listings for determining Diamond Disc side orders. In this case, "The Gladiator March" is the L side, so should be listed as the B side here. Unfortunately, there is not a listing for this disc in The Edison Phonograph Monthly, but "The Gladiator March" was also released on Blue Amberol 2708. If you consult Allan Sutton's "Edison Blue Amberol Cylinders", you'll see that cylinder 2708 is cross-referenced to Diamond Disc 50286-L. It is also listed as the L side (and "The Navy Swing" as the R side) on the Diamond Disc list published here: https://www.truesoundtransfers.de/disco.htm
Comment by Mike Gann:
Talking Machine World lists "The Gladiator March" as the top side.