Parker was wary of putting the Duofold name on the jade pens and pencils at first - so you are technically correct about that one. Of course, they later changed their mind and did label them as such. I still contend that a pen or pencil does not have to explicitly say "Sr" to be one. In fact, I don't think any of the Duofold pens actually say Senior on them. Some of the Jr's have the "JR" imprint, but some don't.
"Big Bro" was on the early pencils (I think just the orange ones - but not sure). That doesn't keep it from being a Sr sized pencil. As for the crown, there were several different styles used. Since I have an orange Big Bro with a longer crown, I don't think the shorter one is necessarily associated with the "Big Bro" pen. My Mandarin has a shorter crown. The fact is that most pen companies weren't terribly consistent with their names and imprints, especially when a line of pens is just getting started.
Edited by Procyon, 30 January 2015 - 10:43 PM.