Need help identifying SPECS of subwoofers

[cyclone]

Hi everyone

i got some PETRAS loudspeakers

my cousins friend gave me an old car and he had them installed in the back but not hooked up,

now i want to sell them but i don't know the power of them and how much there worth

here is the info on them

PETRAS LOUDSPEAKERS 5w1580 8/25/92 7082

451529-3

312

Thanks for all your help!!!

marios

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