Step 1: Download mediafire links.
Step2: paste File 213 on Ultima PSOBB\data\items\model
Step3: paste File 501 on Ultima PSOBB\data\items\texture
step4: desaquip and equip again your ten years blade. Ty to @JupiterDeMars for the info on this step 4.
model: https://www.mediafire.com/file/calbw1dj0mxn5gq/File+213.prs/file
texture: https://www.mediafire.com/file/8q66jf84qngiyah/File+501.prs/file