Conn 464N barrel length

[abellows]

Would anyone happen to have a conn 464N that they could verify the factory Barrel length? I have another Older version 464N that’s barrel is 61.7 mm. There a subtle differences between the two.  They are dated 1936 and a 1940. The 1940 is the overhauled one needing a barrel.

Thanks in advance,
Andrew