"After a few rare transitional "bouche ovale" models with the old 12 fret, 648mm scale ..., the longer 670mm scale was introduced and became standard for the rest of Selmer's production time. Django immediately and eagerly switched to the oval hole model and played it almost exclusively ... until he passed away in 1953."
From lutherie.net
"The mahogany neck has the flat cross-section to the rear encountered on classical guitars and this, together with a fingerboard that measures 1 7/8 inches at the nut, results in a feel quite different from the average steel-string acoustic.
Body size- 12-fret neck joint - Scale length 25 1/4” - Nut width 1 7/8” - Body length 18 1/2” - Lower bout 16” - Upper bout 11 1/4” - 14:1 ratio geared nickel-plated tuning machines..."
From almeria.loquo.com