Adrian, I have read this information (date record, a city, a name of the conductor) in Vladimir Rosing discography (Record Collector; Vol. 36, No 3. July-August-September1991). If in a discography the error means an error and in the description.
Well this is interesting. All I can say is that I have gone through about 60 UK acoustic Vocalions and all have numbers from 01000 to the 04000s. I have a few US Vocalions but these have no visible numbers anywhere except the catalog number. The N number on the label of this Rosing is also visible under the bottom line of text and this is in a UK style.
The few US Vocalion recordings I have that were issued as UK Vocalions mostly have a number prefixed AM (such as AM9067). One more has a number NN12850, a Paul Kochanski which I believe is also a US recording. There's evidence that a number has been scraped out of the stamper where the US catalog number would have appeared.
I wonder if it's possible that two different recordings were issued at different times on A-0230? Does the discography list the same N numbers for it as here?
I have been trying to get to see that Rosing discography. I'll send you a message with a question about it, if you wouldn't mind!