changeover note

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was wondering with the recent signature changes , what is the amount/run of notes that are changeover notes. Any before ? How many after ? Thanks

Since you posted this in the Terminology forum, I'll answer from that perspective.  Technical details such as the exact changeover prefixes and first and last notes are available in the Serial Number Database.

A changeover note is any note from any prefix where a change of some kind occurs.  In practice, all notes from a prefix where there is a series, signature or printing year change are considered changeover notes.

Fictional example:
Let's say current banknotes bear the signatures of Merritt and Mackie.  Prefixes FQA through FQR bear these signatures.  Mr. Merritt moves on to other challenges in his career, and is succeeded by Mr. Zigler.  Now, all new notes using prefixes FQR through FQZ bear the signatures of Zigler and Mackie.  You will notice that FQR has notes bearing both signature pairs.  The last Merritt/Mackie note is FQR 0199999, and the first Zigler/Mackie note is FQR 0200000.  In this fictional example, all FQR notes, regardless of signature, are changeover notes.  Of course, since the vast majority of the prefix bears the Zigler/Mackie signatures, these would be unlikely to bear any premium over FQS notes.  Merritt/Mackie FQR notes on the other hand, would likely exhibit a substantial premium as there are considerably fewer of them.  But ALL FQR notes are changeovers.

It is worth noting that if a prefix is incomplete and does not consist of two different types of notes (for example APM $5 notes or FEN $10 notes), even if it is the last prefix for that variety, these are NOT changeover notes.  They would be considered a "short run".

Thank  You for your reply

Another aspect of changeover terminology is that in some cases all or nearly all existing prefixes are changeovers.  For example every 1954 $1000 bill printed is a changeover as they are all series A/K which covered all of the signature varieties.    In the 1954 $100 notes only 3 prefixes existed A/J, B/J and C/J.  Only C/J is not a changeover technically speaking as there is only one signature variety.... But A/J and B/J are both changeovers.    Similarly in the 1954 $50 notes series A/H and B/H are both changeovers.... and this encompasses all issued notes.   Although examples of C/H notes are in the Bank of Canada museum, they were likely never released.