Got this Optimus 1551 steel font chinamus version from a friend. Swapped it for a nut and a washer . Cleaned up nicely.
Not the most popular Optimus among collectors, but still an Optimus. They do work well though when set up right. I still havn't found out which of the two variations came first. There is this one then the other with the brown plastic parts and "Petromax" style quick starter.
The only ones I have seen are steel for both. I'm pretty sure they both come from the same Chinese factory, but I am guessing at different times.