I also have a ported 57 -- 8.375" barrel. Got it about a year ago as an opportunity purchase. One of my favorite guns, because I really like long-nose N-frames. Haven't shot it much, though.
I don't have a photo that shows the ports as clear as they are on yours, but they have the same kind of trapezoidal shape. I think our guns must have gone to MagnaPort for the work.
That is Magna-port porting on your gun. They are out of Mt Clemons MI. They have been around for a long time.
A bit of acetone and a sharp toothpick will get the gold out. The gold was probably put in using a Bonanza Gold kit which was all the rage 20 years ago. I had a lot of people pay me to do that to their guns...heck if you bought that one around here I may have done it. The process involves mixing the gold powder with an epoxy, wiping it in the lettering, then wiping the excess off after it dries.
You may also try dipping a stiff bristle brush in acetone and scrubbing it out that way. It's pretty easy.
Thanks Curtis I did buy it locally in Batesville but who knows where it started out;-)
David I thought it might have been magna-ported but just did not know.
I have that same 57 except for the porting. Mine was unfired when I got it 7 years ago and had that gold treatment. I've left it alone as it's the only gun I own with it but nice to know it can be reversed easy enough.
Love it! Very nice, Hows it shoot a M57 is on my long list after the M27's if I live long enough LOL and dont go Bankruped. This addiction is over welheming at times