Birth Year Notes are notes with serial numbers like your second example, EAX 0001980. The initial digits must all be zero, and the last four correspond to the year of someone's birth. They generally hold more value to someone born in that year, or to someone who knows someone born in that year.
Birth Day Notes are notes with serial numbers that form the exact day of one's birth, in any arrangement. For example, a birthdate of March 12, 1959 could be represented by any of the following: 3121959, 1959312, 1959123, 1231959, etc. These notes generally hold no premium except to those whose birthdays they represent.
Logged
BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.