No, 561..... is a regular issued note with Crow-Bouey. Here is how it works for the 1979 notes
The first number is the denominational number: 3 or 5. the second is the printer: 0,2,6 for regular or 10,16 for replacement and 30 is test) and the next two are the series number. Finally the last 7 numbers is your regular standard serial number. So if you think about it, the first 4 numbers are like your two or three letter prefixes.
1979 $5
Lawson-Bouey 3000-3046 -Regular
Lawson-Bouey 3100 -Replacement
Lawson-Bouey 3300 -Test (scarce)
Crow-Bouey 3046-3058 -Regular
Crow-Bouey 3100 -Replacement
1979 $20
Lawson-Bouey 5000-5067 -Regular
Lawson-Bouey 5100 -Replacement (scarce)
Crow-Bouey 5067-5099 -Regular
Crow-Bouey 5200-5205 -Regular
Crow-Bouey 5600-5649 -Regular
Crow-Bouey 5100 -Replacement
Crow-Bouey 5160 -Replacement
Thiessen-Crow 5205-5266 -Regular
Thiessen-Crow 5649-5695 -Regular
Thiessen-Crow 5100 -Replacement
Thiessen-Crow 5160 -Replacement
Hope this helps