I've done several of these phone switches and in my experience It's about 1 out of 5 boards that are high grade. That one looks a little more vintage than most of what I go through though. There is also the backplane board (slot board/pin board) behind all the cards that is going to be pretty good payout, about what I get for motherboard price. Each card is similar in size to a desktop motherboard. The Majority of the "line" cards are either not that populated or are populated similar to Modem boards which are heavier, but lower price per pound. Also, there is often a large transformer in the power supply and a ton of cabling in the back.
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