Gibson tulip heads stamped D 169400 tested before removal all working, believed to be pre 1976 but could be 60’s. Please see photos for condition they are as they were removed (not cleaned/serviced) I have had these at least 40 years,but not used for 35 plus years,I will also include the 12 screws,they are from when I fitted them in the early 80,s so probably the original screws,any questions please ask .Checked date on some Gibson sites they say 1969 to 1974 ?