Thanks for your reply.
The resistance of this pickup is around 14.7.
I contacted Dimarzio but they don't have this pickup on their database as it's before that time, so they didn't know what it was.
I thought it might be a Blaze and they guessed it was a Blaze as well but weren't certain.
Do you know which Blaze this is? Blaze II etc.
Dimarzio said it was a Bridge model