I have a prop that is what I believe to be a Merc Chopper. There is a part number 48-1517-A4 26P stamped in the side. All Merc prop numbers I have seen have at least 5 digits after the 48- prefix. To add to the confusion, the part # is either partially worn or was not stamped too deep to begin with. If anyone has any info on this prop, please let me know. The blades also seem thinner than some other choppers I have.