eBay
Some eBay research links include affiliate tracking. These links are used primarily to help readers inspect active or completed marketplace examples. A commission relationship does not make an asking price reliable evidence of value.
Amazon
Some preservation, photography, packing or storage-supply links may be Amazon affiliate links. Product inclusion does not mean every material is appropriate for every collectible.
Editorial independence
Affiliate economics do not change the rule: identify the object correctly, preserve evidence and compare multiple sources.