WW1 Royal Engineers Marked Binoculars

[Spitace41]

This is the latest addition to my binocular collection. The binos themselves are marked with the Broad Arrow and S.4 M.2876. The S.4 I believe was the grading given by the army when these binos were required from civilian stocks. Anyway the interesting thing about these is the case marking 4 over 82 RE which I take to mean No. 4 Section 82nd Field Company Royal Engineers (I am open to correction though). If this is the case this unit saw action along the Western Front from Loos to the Sambre attached to the 19th and later 18th Divisions. 82nd Field Company, Royal Engineers

Does anyone agree that the 4 would be the section number or could it be something else? Thanks for looking.