BBX Small B VS Large B... How can you tell?

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Since we were on the subject earlier with BBP... im having the same problem with my BBX note. I cannot tell rather or not it has a small B. Is there a defined change-over point (like FNX) where small B becomes large???
By the way mine is BBX 3861828 (Thiessen-Crow)... can you tell by the number?

The purpose of the earlier question was to help define a changeover point.

Please check page 274 of the Charlton Guide, 17th Edition for examples of the Big B vs Small B.

The changeover is somewhere between these notes.
[Added to the list --BWJM]

I've created a list and some corresponding threads to report new numbers.  Please post new finds there.

Thanks!