The Amp In Case era began in 1962, when Daniel and Fisher put their heads together and came up with a price/feature set that appealed to thousands of families across the country.
The 1448/9/57 combos sold and sold and sold, and that's why we have such an active collecting market in those particular instruments today. The solid body 'replacements' for those ground-breaking instruments, the 1451 and 1452, never really had a chance to sell in large numbers, as Danelectro's fortunes fell in the late 60s after their sale to MCA.
By the time Neil Armstrong set foot on the moon, Silvertone was a memory fast fading from the halls of Sears, Roebuck & Co.
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