For those that have one- are the early stainless baseplates marked in any way? I have seen pics, with only 1 brass plate having a "T" stamp. How do you know what you have? I just found an Evolution baseplate on the 'bay, and the seller wasn't sure. Worst case scenario, I take some 200 grit wet/dry and open the gap up myself, but if someone can provide a clue...? Please & thank you!