I need some help figuring out who made this plane. I just picked it up on Craigslist. The plane iron has an image of an “Anvil” engraved in it with the letters R.T. then the word “trademark” is this the plane maker? If so I cant find anything written on-line about it. other then these markings on the iron there is nothing on the body of the plane. I looked everywhere, under the frog and handle/knob. The only marking in the casting is a No 3 on the toe. Help.