Forthewall...you did not identify it correctly. Go back and look at your first thread and also RELH's thread. You said, "Ruger Blackhawk .45 speed six/service six revolver." The blackhawk was a single action revolver. The service six is a double action revolver. There is no such thing as a Blackhawk Speed Six. And, they are not even close to being the same thing...except that they are possibly made in the same Ruger factory and you'd read about them on the same page on Wikipedia. ONe is still made, the other stopped production in '88.
http://en.wikipedia.org/wiki/Super_Redhawk
Border Patrol Agents were never issued those guns, in .45. For a time, they were issued those guns in .357. Which is very fortunate as the .357 has the habit of disabling people that it hits and making them lay on the ground.
Back in the transition days (when some Agents were allowed to buy their own jam-a-matic or carry an issue revolver)...Agents would go back to the academy for some sort of advanced training. They would have the AGents shoot some sort of stress or ipsc type course. The revolver guys would often, if not always out shoot the auto guys...the revolver guys would shoot 2 shots in the center of the paper targets, and the steel plates would fall down. The auto guys would try shoot fast enough to over come their misses and shoot 2-3 times at the steel targets and have poor hits on the paper. The score is determined by points of the paper target (numerical score) divided by the shooting time...w/all reloads. That revolver can reloaded in under 3 secs, w/speed loaders, and about 5 secs or so w/loops.
The Border Patrol started getting issued .357's SOMETIME after it came about...say in the 40's or 50's. Ruger started making those making the Service Six in '70...long after the switch...hence, never in .45. I had one at the academy, in .357, and I'd rather have carried it than the poj Beretta that replaced it (and the the only reason we had it was in order to have cruise missiles in Italy).
BTW, depending on where you live, your gun is worth $450 (if you live in such communist places as NY, IL, or another anti-gun bastion) to $250 (for the most pro-gun locale on the planet). Even in TX or CO it could grab $350, if you waited. It is easily worth $250 and I'd ask $300 (Western-CO). I'd expect to see in for sale for at least $300 in my area.
What caliber is it in? I assume .45acp and not .45LC. Is it stainless or blued?
$200 is LOW. I may be interested in it, if that is all you want.