150 pdr is not a designation that I am familiar with. The nearest I can find to 150 pounds is a Shell, RML, 7-inch, Double which has a filled weight close to 150 pounds. The fuzing seems to be No 41 (wooden Boxer type fuze), or the No 3 fuze.
No. 43 is similar to the No. 41, Two mods of the No.3 are shown.
Kind Regards,
John