Sportscaster Promo Cards - Numbering System?

I've seen that the promotional cards have the numbering system 993-xx.  This has been found in a few of the different sets.  Has anyone seen anything else?

I found a few oddities with the set from Finland.  The cards below have no numbering at all.  I have more of these cards than others, so I am guessing they might have been promotional cards as well.

Does anyone know much about these cards?

Martti Vainio and Pekka Vasala were both Finnish athletes.  I imagine that this factors into the distribution of these cards.