There are two kinds of original Remington Broncho Busters: lifetime and posthumous. Those cast after Remington’s death in 1909 were overseen by his widow, Eva Remington, until her death in 1918. In her will, she ordered the original models to be destroyed. Lifetime castings are widely considered superior castings compared to the posthumous. Remington was alive and his standard were high when he examined each casting before it was sold. This did not happen after his death.
The Broncho Buster was cast by two foundries: Henry Bonnard Foundry and Roman Bronze Works. Approximately 64 bronzes were cast by Bonnard. Then, after a fire at the foundry, Remington switched to Roman Bronze Works, where he cast 89 lifetime casts.
Bonnard utilized the sand casting method, and by definition all 64 castings are identical save for patina.
Roman Bronze Works utilized the lost wax method, which required Remington to touch up the original model worn down from repeated castings. This need to touch up the model allowed Remington to experiment with the details of the original model, most obviously seen with the position and appearance of the horse’s tail. But other details changed considerably: the horse’s main, the brim of the cowboy’s hat, etc. So when one owns a lifetime Roman Bronze Works casting the chances are very high they own a unique casting.