I believe the date code is '
e' for 1926
The chambers are 2 3/4"
After 1924, the 18.3 and 18.4 are the bore in mm and CHOKE only indicates muzzle constriction > .008" so the choke will need to be measured
The barrel tubes are quality Siemens-Martin fabricated by Delcour Dupont (the crowned D)
Cornell Pubs has a 1925-26 Von Lengerke & Detmold catalog repro which should confirm the model
https://cornellpubs.com/product/997/The post-1910 models are listed here
https://www.shotgunworld.com/threads/abercrombie-fitch-von-lengerke-detmold-and-francotte.393236/
