I was hoping for information on the following item. Including who it may have been used by / rough date.

Embossed CARR Q.F 18PR MKIV & IVR

I understand that 18 Pounder guns were used throughout the wars. ‘
‘The 18-pounder was used on all fronts during the First World War. It remained in service during the inter-war period. Starting in 1938, carriages Marks IV and V were converted to 25 Pounder Ordnance QF Mark 1 on Carriage Mark 1. 18-pounder Guns served with the British Expeditionary Force in France in the Second World War and were used in other theatres as well as for training or beach defence’.

Would this suggest the case dates between WW1-WW2? Made from a thick hide.

I was also wondering what the IVR stood for? Was this perhaps the carriage ?

Appreciate your time.

Warm Regards, Gillan Bell.