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...same here...Sierra 10.12.6....

I must say that I too when it comes to things technological very much subscribe to the "if (now!) things are working, leave it alone!" school of thought. 😀

I for one would be grateful if you didn't upgrade the software - I've not experienced any of the problems mentioned but I do use a very old version (the latest allowed for my OS ) of Firefox and I suspect that an upgrade may stop it working?

Not quite correct. Date spacings vary on both reverses and are not positive identifiers (see screenshot of Richard's site below) and I have actually seen three spacings - narrowish and properly wide as per Richard's pictures and even narrower as per your comparison one! (Your new find is the same as Richard's first pic - narrowish with 0 just to right of bead) The true identifier is the lack of the extra line in the shield for A# (also in Richard's screenshot) as well as the flag pole thing. But yes, yours is indeed a no-knot 1* plus A# - well found! It is known on circulation specimens as well as proofs, but don't yet know how rare it is, but suspect quite rare indeed!