Red number 53 on slice edge is a C.U. Shepard # from the USNM 1902 catalog.
S335 is Jim Schwade's collection #
USNM 1902 meteorite collection catalog
Page 697 of the USNM 1902 catalog with reference to the C.U. Shepard #53. The 36.5 gram section (b) has obviously been polished and lost 1.5 grams since 1902.