The Philco made single speed 33 1/3 only attachment was Philco made as correctly posted earlier. That Philco attachment was the first 1948 LP player when Columbia launched the LP Record in 1948. You have the second or third model Columbia LP era attachment. It is beautiful. Yes, try the EV Stereo ceramic upgrade so it will be easier on record life. This Columbia is a very interesting early LP player and historically interesting. Those hash marks between speeds on the speed indicator are most likely neutral positions to protect the idler wheel. Try them.
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