Funny enough, after looking, I remembered that I DID create a single.php. The theme is Atahualpa, which doesn't natively include single.php. However, I wanted to have a CPT class for all custom content, so I created single.php as an exact copy of index.php (per Atahualpa instruction) and then added in this as the first line:
<div class="post-type-<?php echo get_post_type();?>">
And I closed the div at the end of the file:
When I used Chrome's View Page Source between my Home and Product page, I see all meta data and the favicon link. The only difference is the very beginning of the file with this new div and class callout on the individual Product pages. Any further ideas?