I won a 1909 E92 Dockmans Gum card in the Sterling Auction that closed last night. When I went to look up the pop report for that issue, there is a column for the grade "35"...with zero cards graded for that grade.
I also had a BIN yesterday for a 1936 World Wide Gum card, and the "35" shows up in the pop report for that issue too.
I haven't looked at any post-WW2 pop reports yet - I just assumed that they have the 35 grade there too...