Help needed with the B.S.

[PikesPeakCharlie]

Hi all . I know that this is a US Equestrian team trophy , I know they won gold in the 1959 Pan American Games in Chicago . The top of the engraving reads U.S.E.T.B.S. I can not figure out the B.S. Any help on what that stands for would be great,thanks. PPC HH

 

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[Rookster]

No it wouldn't be that. Sorry. I like it.

 

[HuntinDog]

Could it be British Showjumping??
The governing body of show jumping in the UK is British Showjumping (BS).