Updated with a reply from the seller. My email first, then his response. Doesn't seem to deny it may not be a "factory" Bisley, but seems OK with letting potential buyers being deceived. Buyer beware.
"Hello, pic #9 showing the box label indicates this gun was shipped as a BN-42 which is a regular 6.5" Blackhawk with the regular plow handle grip. Also, every large frame Bisley was shipped with a 7.5" barrel and the part # for the 41 fluted Bisley is RB-41, not BN-42. The Bisley parts on this gun seem to have been added later. As much as it appears whoever added them did a great job, you may run into issues if the eventual buyer tries to have this gun verified by Ruger and it fails. Just an FYI, trying to help out. I own 4 of the fluted and 3 of the rollmarked 41 Bisleys and like them a lot. Again, I'm not trying to harm your sale, just offering some insight and info to help. Good luck with your sale. Shane"
"I bought the gun at auction just as it is, it seems I have all the information in the pictures needed to know what it might be. Thanks, Ed"