Projectile ID needed

[oldbattleaxe]

Once again I need the forums help. This projectile measures 7 inches long. It is 1 3/4 at the base. There are no stamps other than two odd looking marks visible in the picture. My thinking is early WW1 37mm. I am not sure. Thanks in advance

 

[Charlie P. (NY)]

I'm thinking a Hotchkiss 37mm

 

[oldbattleaxe]

Most WW1 37mm are marked with a date and factory marks.

 

[sutphin]

BIG BIG BULLET.......

 

[NOLA_Ken]

My thought is WW1 or earlier British 1 Pounder. It looks like the projectile has been driven too far into the casing if you look at the arrows I added to your pic you can see the edge of the casing has a gap where the shell goes into it, and a bulge in the case neck, possibly caused by the driving band. If you can carefully remove the projectile there may be more info on it, and you'll be able to tell if it was a base fused explosive shot or a solid shot.