Monitor 5 series ii with sl2500 tweeters

Hello all, I came across a pair of Polks for sale today. They are monitor 5 with the sl2500 tweeters. I opened them up and found a sticker inside with a build date of 11/06/90, however neither mid has the label which is common on most polk mids.

Does anyone know what mid model number is used in these?
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