Agree with what Dave said, except it's a TG (tig welded), not an LT (lugged). Both had Tange Prestige tubing as standard, but I have it from a reputable source that Serotta often substituted tubing depending on what they had in stock. The TG was the first tig welded Serotta road frame. It was introduced in 1992 and your #52 was surely made that year.
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