Nice find! If you click on Download at the top of the Forum home page, you should find the order form for the history letter. It may take up to 6 months to arrive but be patient.
At the time your model 18 was produced, it had a 4" barrel with a ramp front sight and the model 17 had a 6" with a Patridge front; that was about the extent of the difference between the two. Please repost here once you have the letter?
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Alan
SWCA LM 2023, SWHF 220
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