If it is the 210/6.3 Computar Symmetrigon, than you have a most excellent lens. Designed in the USA, made in Japan. A "symmetrical 4-element, flat-field lens with single coating on the glass". (not a Plasmat, plasma, whatever.)
They came with a great screw-on lens shade. I used the lens for both 4x5 and 5x7. I never had any coverage issues. Sharp (very sharp), great contrast (the lens shade helps here!)
In 1980, I bought a new 4x5, made in India that came with a Computar Symmetrigon 210/6.3 for about $525. I was not expecting much from the lens, but was happily surprised. It and the camera (with a 5x7 back) got stolen in 1995, and I finally replaced it a few years back when I started using a 5x7 again. For awhile they were cheaper on the used market than the value of the Copal #1 shutter they are in!