I've owned a several non Stevens rifles that were rebarreled at Stevens, and all of mine were marked to indicate Stevens did the rebarrel. Both were marked under the forearm, and one was also marked on the top flat as being a Stevens-Pope built barrel.
I have another that is a Ballard #3 originally in .22RF that was rebored, and rifled to .25 Stevens RF, and the markings are under the forearm indicating Stevens did the rebore, and the caliber marking also.
I would suppose it's possible a customer could ask to have no markings, but this rifle barrel being marked doesn't really answer the question who did it, unless it would be also marked as being rebarreled by J Stevens as some were.