If you were rifling through your grandmother's shoebox of old photographs, this one would not look out of place. That's because the subject matter and the conversion work so well together.
B&W conversions are difficult, as plenty of threads here attest. Does the 'tog go out especially to find a B&W situation, or is it a case of "can I rescue this image by converting it to B&W?" In my view, the latter option rarely works.
Anyway, here is the image - it is inmotion's local horse show picture:

It is the image without the red border - I agree with others that it is the better of the two. I like the vignetting too.
And you can pick up the thread here:
http://www.dslrusers.com/viewtopic.php?f=18&t=41904