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The first evidence I can find of the #89 Rancher is in the 1972 catalog when they introduced the "Indian Stag" line. All in that line were Sword Brand and it was etched on the main blade. So I think the answer to your question is yes, all #89s were Sword Brand and they all had the Indian Stag Delrin handles. The last catalog I see them listed in was 1979. So, if yours has the long line stamp, that would indicate it was one of the earlier ones (closer to 1972). IMHO
Forged on the anvil of discipline.
The Few. The Proud.
This country has become more about sub-groups than about it's unity as a nation.
"The #72 pattern has got to be pretty close to the perfect knife."
--T.J. Murphy 2012