Pretty sure that picture is the only one running around. Internet search turns up that picture and different angles also labeled as Yamamoto, but hull steel. Some blogs reference the picture as part of front armor of the gun turret.I wish I could find the pic of the test done on a Yamato class gun face plate 20 inches of face hardened plate
The guns were never completed:When Shinanno was turned into a Carrier the guns had been made her and never used wonder why they didn't use them as fixed gun in placement to defend Japan
They are the second longest pair of tubes, there is a single longer tube from a German railway gun in the same area.They measure ~68' long the pair just behind the gun line across from the 5-inch (127-mm) 62-caliber Mk 45 Mod 4 Naval Gun system?