The plot thickens-----------------------
I went back to Jinks' History of Smith & Wesson to make sure I'd quoted him correctly. Sure enough, "Any one of these options (caliber options), in fixed or target version, could be ordered from the factory for $21."
Now, as far as the thickening plot goes, he doesn't even mention the 7 1/2" barrel in this book. He notes the 5" and 6 1/2", a "limited quantity" of 4"---and that's all! A 7 1/2" was all I ever had, until I stumbled upon that 6 1/2" King Super Target several years ago----and never gave any thought to how rare the 7 1/2" might be---not paying attention I reckon.
Well, now I am. N&J does note the 7 1/2", but doesn't mention anything besides nuts and bolts technical stuff--which is pretty much what that work is all about anyway. The SCSW (4th) notes the 7 1/2" barrel, and more importantly, also notes, "Barrel lengths other than 6 1/2" will bring a premium; often 50% or more." I didn't take the time to check the three earlier editions, but anything noteworthy would be repeated in the 4th. The values noted go like so: As New In Box $12,000, Exc+ $7500. Exc $5000, VG $2500, Good $1500, and Fair $950. Note these values are circa 2016, and remember that kicker, "Barrel lengths other than 6 1/2" will bring a premium; often 50% or more."
That's about all the news fit to print.
Ralph Tremaine