Late 50's style K/G blade.
Rome, what differences tell you the age/time period of the blade? I've worked on a couple of them but don't know much history of the variations.
Looks like that one still has a decent edge but the stinger got left in a big red oak at some point.
The early blades [1950's to early 60's] had the round pipe on top for the guide bar and they also had short "stingers" where the later blades had a square bar and longer stingers and wider cutting edges. The side braces were also updated in the early 70's to ball and socket type instead of the pin type. I have some photo's I can post when I get more time.
Good history lesson. All the ones I've dealt with had round tube guide bars. Were those actually Rome branded or built before Rome started producing them?