De la part de Chralie Clelland et Lieven DeKoninck
I notice you had added a 12cm Belgian fortress gun to the blog recently. By chance I have an image of the
plaque inside the carriage - it says the Krupp/FRC gun is 15cm (attached).
The 15cm Krupp/FRC howitzer is on the background of your image of the "12cm" gun.
The barrel was cast in Liege in 1895.
Image credit - Lieven de Coninck