Spectral comparison of SN 2019wxt at +6.5 d (upper panel) and +15.6 d (lower panel) to a sample of ultra-stripped SNe at similar phases. Low S/N spectra have been smoothed with a Savitzky-Golay filter (with a 100 Å window) for presentation purposes. We also show the possible Type IIb ultra-stripped SN 2019ehk in the lower panel. The flat topped line at ∼6500 Å that has been suggested to be Hα (De et al. 2021) is either much weaker or absent in SN 2019wxt.