"Changeover" designation

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I often see on e-bay notes advertised as "changeovers" when this is somewhat irrelevant.  A few examples:  1954 $50 bills.  There were three changeover points in prefix A/H, and one in prefix B/H.  Since the only known C/H notes are in the National currency collection, it could be said that every 1954 $50 bill is a changeover.

1954 $100 bill - every A/J and B/J note would be a changeover...  only C/J would not be.  Thus 20,000,000 out of 23,712,000  (84%) of 1954 $100 bills are changeovers.

1954 $1000 bill -  A/K is the only prefix thus every note would be a changeover.

I probably could go on but I think you get my point.

Should we have a stricter criteria on what should be considered a changeover note?
i.e  with a certain fixed number or percentage away from the actual known changeover?    For example (using fixed numbers at the nearest 1.0M) in the 1954 $50s only A/H 1.0M,  A/H 2.0M,  A/H 9.0M and B/H 8.0M would be considered changeovers.   Or a stricter criteria of +/- 50,000 away from the changeover would make (for example) A/H 1390000 to 1490000 as changeovers.   Comments??

Great idea, but that won't work for everything. There are some changeover notes that no matter where the note lies within, is still very hard to obtain.

If you start making exceptions to one or two, this can create a problem, well how about a few more added to the exception list, then we are back to where we are right now.

The book is not too bad on reflecting the price of the common changeovers.

I'm going to side with Elwoodbluesca on this one. I think the definition is best left in a generalized manner for the time being.

For example: AZN had a changeover at 1847499. Are only the notes above 0847499 changeovers? Then we've got a narrow range of "non-changeover 2004 AZN notes - even rarer than the changeovers!". You can see where this will lead.

or we could simply say AZN is a changeover prefix

So now my AZN9812451 note is a changeover? Seems rather counterproductive when considering the original suggestion of limiting the definition of a "changeover".

AZN had a changeover at 1847499. Are only the notes above 0847499 changeovers?

Should this read above 1847499 ...or is this a trick question

Not a trick question at all... The suggestion made previously was to limit the definition of a changeover note to be all notes within a certain margin of the actual changeover point. My example assumed a margin of 1.0 million notes, making the AZN changeover range 0847500 to 2847499.

I personally think that the current ambiguity is best, as defining specific ranges as proposed would lead to several issues as I unearthed above.