I believe it is an about 1922 No. 1S with Cockerill Steel barrels; tubes made by Laurent Lochet-Habran.
The 'LLH' is also found on Field Grade "Smokeless Powder Steel" barrels

1924 Janney, Semple, Hill & Co. catalog

[Linked Image from photos.smugmug.com]

'4' indicates Full choke