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There was an inline 23" tube made into the early 80's, but am not sure how late...these sets would have been called "system 3"
81 is pretty late for the delta gun 23" tube, so if this set was truly made in 1981 the tube may be an inline.
If it is a delta gun tube it is a great find as even if the set doesn't work or is not a style you like as you can use the tube in any of the older 23" sets.
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