[collectibles] Jaguar leaper mascot - identification (1939 model?)

Hello,

I bought an old motorbike not long ago and on the front
there is a Jaguar leaper mascot fitted on it. The old guy I
bought it from told me that it worth a fortune as it is from
a 30s model… I did not really pay attention to him.
I went to take my bike to the mechnanic recently and he told
me the same and that I should remove it from the bike before
someone who know steal it from there… According to him it
is from a 1939 model.

I am wondering if those people are right. Do you know where
I could identify this leaper mascot?

Many thanks,

Julien–
Taojul
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