What is it? 75MM projectile

[Steve762]

Here is a question for the ordnance experts on the forum. What is it? Pic attached.

Description:
-- 75MM projectile. Flat base. One driving band.
-- Unfired.
-- Inert body and fuze.
-- Does not appear to be a dug relic. Very little rust inside or out.
-- No markings or paint on body, base or fuze.

Shell has the appearance of a WWI French HE shell with the following differences:
- Exterior of shell body was nickel plated.
- A round 55MM hole drilled in the body. No nickel plating where hole drilled in body. No burrs or tool marks.
- No residue or carbon or burn marks on the inside of the shell body or fuze.

Could this be a WWI French 75MM gas shell that was de-milled or a training aid?

An ID and value in USD would be very helpful. Regards, Steve