New old stock part I think, hard to tell.  I have 4 that are marked 251260R1 & 4 that I think are marked 251261R1.  I assume one is an intake valve and one is an exhaust valve.  I am selling them as a pair of 2, one of each.  See photos for detail and condition.  Includes only what is pictured. Envelope or box not included if multiple items listed.