Just for kicks - and anyone else who cares - I figured most of it out. If anyone knows the four unknown values I would be interested. As they all only have a length of one I think they may be just used to separate the other values, but I'm not sure...

Description       Place    Size  Type

Label Name        01 - 11   11   Character
Label Dimensions  12 - 34   23   Character
Number Across     35 - 37   03   Numeric
Unknown           38 - 38   01   
Left Page Margin  39 - 45   07   Numeric
Number Across     46 - 47   02   Numeric
Unknown           48 - 48   01   
Space Between     49 - 56   08   Numeric
Label Width       57 - 63   07   Numeric
Unknown           64 - 64   01   
Top Page Margin   65 - 71   07   Numeric
Unknown           72 - 72   01   
Label Height      73 - 79   07   Numeric
Metric?           80 - 80   01   Logical

Renoir