Here is the honest reality: Tamiya does not openly host a full, free PDF of their annual catalog on their main global website. They treat their catalogs as collectible printed items. However, the PDF exists in the community. Here is how to find it legitimately:
If you need the PDF for high-resolution printing, consider buying a physical copy of the 2013 catalog (often $10-$20 on eBay) and scanning it yourself. The physical copy has much higher DPI than any compressed web PDF. tamiya 2013 catalog pdf
: These platforms are the most common hosts for fan-uploaded hobby catalogs. You can find partial scans or related publications from that era, such as the Tamiya Model Magazine International 2013 issues Tamiya Online Archive : While not a single PDF, the official Tamiya Product Archive Here is the honest reality: Tamiya does not