Before 2017
The first 6 are saddle specific serial numbers (315822)
The last 2 digits represent the gullet width (7W - 7inch Wide)
2017 to Present
The first two numbers represent the year (2018)
The next two numbers represent the model (14 - HP)
The next 3 numbers represent the seat size (150 - 15inch)
The next 3 numbers represent the gullet width (070 - 7inch)
The last 5 numbers are is a factory serial number specific to the saddle (00154)