The date code is stamped on the rear of the chassis below the chassis designation. My set, with serial number B8801425, is stamped:
CTC2B
501 L
RVB274
501 means 1st week of 1955.
The bottom line means Radiola Victrola division Bloomington. 274 is RCA's EIA manufacturer code.
The CTC4 listings on the ETF site are the other early chassis type with 21" CRT. If you look to the left you can see that the section is RCA 21", not just 21-CT-55.
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Tim
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