I don't know which sn list you are using but here is a serial number / model list for prewar Rolleiflex:
https://tlr.rolleigraphy.eu/snprewar.php
Rolleiflex models often have overlapping serial number ranges, and according to that page the sn 830nnn could be in the range of either a New Standard or an Automat model 3, presumably because they were making/selling both models at the same time to hit two price points. Yours looks like an Automat (maybe model 1 since I think it has a filter bayonet only on the taking lens). So it's an Automat. I don't think that SN lists are always totally reliable about the small feature differences between different iterations of the same model, that is the seeming inconsistency between SN and whether it's an Automat 1 or 3 is not significant to me (maybe to a Rollei obsessive).
Your camera has the retail packaging and so on (impressive), so I see no reason to think it's an oddball or pre-production.