Buck/Mayo with 420?

[The Savage Rabbit]

When I purchased my Trio today at Sport Chalet I saw some Buck/Mayo folders which had the steel listed as "420." Price was about $40 to $50. All of the other Buck products on the rack were labled 420HC. Was this a product labeling error or does Buck use straight 420 on some of their knives and, if so, even on some of the Mayo Collaberations?

 

[wh4f]

............

 

[The Savage Rabbit]

If I were Buck I'd have words with that distributor or whom ever is responsible for packaging that shipment. To the average consumer, it doesn't look like another term for 420HC when other products on the same wrack are specifically labled "420HC."