1011RBS - Inline, no Split E
1011RBSO - Offset, no Split E (on the website, the "Inline" shouldn't be there)
1011RBES - Offset, with Split E
Even though the flute itself might be marked "1011" or "1011R", you need to look at the keys to figure out whether it is offset or has a split E or not. If you don't know what a split E looks like, try the following website:
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