The Sterlingworth cards are mostly pretty bleak, and imho for 90% of common Sterlingworths a letter isn't worth $30.



On the other hand, in the case of this 16-gauge Fox-Sterlingworth Ejector DeLuxe both the original production card and a Fox-Special card survived in the records --





Most of the surviving cards are the original production card as the gun was built. Very few of the Fox-Special cards used when a "built for stock" gun was modified to fill an order have survived.