Yes, just like the U. S. Border Patrol knife shown above with the BP0108 serial. That issue was a SFO (special factory order), but many of them were for Schrade's own limited editions. Those often, but not always, had the ivory colored Delrin handle covers with special scrimshaw art. Some had special shielding added instead such as for MAC Tools Anniversary, usually with a special blade etch. Or the customer might have only ordered their knives with serials and etch. Schrade would make a customer pretty much anything they wanted. You pay, they'd play.
Almost always, more knives were produced than ordered. Some were rejected during production, some on final inspection, and some held for warranty replacement. I note for instance that my Border Patrol knife was never used, yet had hits on the bolsters. And it distinctly lacks the usual gold paint fill in the lasered lettering on the wood covers. IMHO, it was a production reject. Had the order been for 500 pieces, there might be an example out there serialed #BP0535.