Well its got a card in the PDS slot with a DB connector of about that size, so I'd guess thats what it is. While it could be an AUI ethernet or video card, I'm hedging my bets on it being a IIe card.

According to the serial number, it was built in Fremont, CA...interesting. While we here in Australia did get some Macs from Fremont (my Quadra 700 came from Fremont, as did my original Mac), I think all the LC series Macs I've seen have been Singapore-built.