This is a copper mark master mason penny from Greeley Chapter, No. 13, Royal Arch Masons (R.A.M.). This coin features a keystone with the letters KSHTWSST around the center which is engraved RMD. A bell and hammer flank the keystone. One Penny is stamped at the center on the reverse side.
Obverse: "Greeley Chapter No. 13 | R.A.M. | Greeley, Colorado". Reverse: "One Penny".