You are right there Ed and will know more than I.
Kevin will need to confirm that serial number and provide more of a description, images would assist greatly
The earliest L pattern I have is a 1912 Hazard bought as parts from a very good mate down South. The other is that rough stocked project from 1922 - # L147XX that I bought from Declan.
With generosity from my friend I have a a two piece stock for that 1922 now. Some previous owner had cut two inches off (for a son??) and retained the cut off section. It can be seen that an attempt has been made to join the two parts with large nails- rough indeed.
Both these L patterns shoot well.