Pulsars frequency of 81 MHz (Hewish et al. 1968).
This I think the very first, or one of the very first Pulsars found. (Hewish et al. 1968) https://www.aanda.org/articles/aa/full_html/2011/06/aa16681-11/aa16681-11.html#:~:text=Pulsars%20are%20rapidly%20rotating%2C%20highly,1968).
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