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From photos and videos, it appears Beck plays several Silvertone 1448 Guitars. One instance is a Silvertone 1448 with some stickers and capo as seen in this video of him performing "Black Tambourine" in 2005, and another one is used in the same session in this link: http://www.youtube.com/watch?v=LzPsbOTdCvY (no sticker, different strap, and Drop D tuning).
The source and notes on this submission are correct.
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