Thanks Bill for sharing this tremendous observation. Certainly the best I’ve seen from the amateur community. I thought about comparing the spectrum with that recorded in Chile at the VLT FORS1 instrument taken in 2002 but sadly the two spectra are from different regions of the optical spectrum. So you may very well be correct that yours is the best so far obtained in that spectral range. See:
https://repository.arizona.edu/bitstream/handle/10150/656680/azu_meteoritics_v39_n4_609_616_m.pdf?sequence=1
British Astronomical Association
Supporting amateur astronomers since 1890