Paz-Bailey, G.; Adams, L.; Wong, J.M.; Poehling, K.A.; Chen, W.H.; McNally, V.; Atmar, R.L.; Waterman, S.H. Dengue vaccine: Recommendations of the Advisory Committee on Immunization Practices, United States, 2021. MMWR Recomm. Rep. 2021, 70, 1–16. [Google Scholar] [Cro...
and also on some Morrison pens (a 2nd tier US company back in the 1920s-40s). In fact, had you not said it said "Matador" my initial guess would have been that it was a Morrison. I have a couple of Morrison ringtops
Paz-Bailey, G.; Adams, L.; Wong, J.M.; Poehling, K.A.; Chen, W.H.; McNally, V.; Atmar, R.L.; Waterman, S.H. Dengue vaccine: Recommendations of the Advisory Committee on Immunization Practices, United States, 2021. MMWR Recomm. Rep. 2021, 70, 1–16. [Google Scholar] [Cro...