Lion on Crowned Shield, Image by StuE, Found by Garry J.
A substantial seal with N 19 and possibly a C above it on one side. On the other side on the rivet is (truncated) a crowned lion rampant holding a sword on all on a shield which is itself crowned.
A Dutch customs seal of the type with long strip of lead (100mm) joining both lobes forming a loop (See other Dutch Customs Looped seals).
See PAS LON-8FDA34 "Lead-alloy seal for attachment to a cow's ear. One side has illegible lettering and possibly '78'; other side has a rampant animal with staff/sword all below crown. These seals attached to the ears of live animals imported from the Netherlands from c. 1814 on, probably into the 20th century (Geoff Egan, pers comm)."
From Jan van Oostveen, "It was only used for the tail and not for the ear. ... from authentic documentation from the mid-19th century where it is mentioned how these seals were used. [Scheffer, D.H., 1909. De Geslachtswet. Amsterdam.]" See Oostveen, J. van, 2019, Tax seals used in The Netherlands as proof that 'accijns op het geslacht' was paid.