75mm blank ID help needed

I think it’s a blank anyway

On the left

Obviously a Norwegain made one by Bakelittfabrikken.

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Pack Howitzer M1?

Made for US M101 howitzers in Norwegian service.

M101 is 105mm. This says 75mm.

Yes, but the Norwegian guns were converted to 75 mm for this purpose.

I found this on Wikipedia

Two M2 howitzers (1942) are still employed in providing the gun salute at Kristiansten Fortress, in Trondheim, Norway. M101/M2 is one of three approved salute guns in the Norwegian armed forces, and have been reduced to a caliber of 75 millimetres (3.0 in) for this purpose. They are used for gun salute also at Rena and Setermoen.