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We have a prototype Westinghouse set at the museum. It is possible that it once had a 15HP22 in it, but there is no way to find out.
Another interesting thing. The CRT shields were apparently labeled with the same serial number as the cabinet backs. We have 6 of these numbers in our database, ranging from 005284 to 006226 (the number on Dave's shield). This might indicate that his tube was fitted in one of the later sets rather than a prototype.
The date on his tube is April of 1954, which is the same month that Westinghouse started selling the set.
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