Is this on the same site as the comics?
If not, you can set to show qty in stock in Catalog > Product Types > Product-General > edit layout.
If yes, you can get the different display options in two ways.
You can create a new product type for pins which can have its own settings; this requires a new database table and some files & editing.
Or you can set qty in stock to "on" and add a test in the qty display code to skip if in a comics category (or to show it only if in a pins category, whichever is easier). You would do this in /includes/templates/your_template/templates/tpl_product_info_display.php.
See the
Parent Categories Separated In 3 sideboxes thread for how to distinguish categories to use.
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