Found what appears to be a Great Seal Button in my backyard yesterday. On the front on the left facing ribbon it has INF. On the reverse, which has a full stem, it says R Liebmann Mfg. Co, Newark, NJ. Will try and post a good pic of it. Any info on these or how to date them. From my research, it appears to be WWI era. Is in really great shape with very little wear.