I actually saw that one on GB and was wondering what it would go for. That's not a factory nickel job (2 on rear of cylinder instead of an N) but the nickel looks to be in decent shape. Looking at the forcing cone area, it doesn't look like it's been shot too much as I see almost no erosion in the forcing cone area. As long as it locks up tight and has no hitches in the trigger pull I think you did good. I would say you didn't get a screaming deal, but rather a fair price for a desirable gun. And a revolver that will give you a lifetime of quality service.

As you might can tell, I love model 27's myself.