I've got a 1950EG in 300 that is D&T but only has an arrow, -->, for an LBC, S#556xxx, posted back in 2013. Don't recall who but a member here suggested that it might not be uncommon since year coding on the lever boss started in 1949 and the 1949 and 1950 year models may have contained earlier ones that didn't have any LBC or perhaps some other stamping.
