Here is a comparison of my heat-treated experimental dagger/spear to the famous pattern-welded spear in the Helsinki museum. As I mentioned before the experiment was solely on creating teeth on both sides and in no way meant to be a re-creation. Nonetheless, it seems that at least the spacing of the teeth is pretty comparable. I need to do a few more experiments but I am slowly getting closer to an attempt of recreating this spear. That project will be video documented, so stay tuned.