Late war M1 with unknown unit marking...

[Leaftree]

Recently picked up what looks to be a late war M1.
- McCord shell with heat stamp. it is not fully visible (a 3 or 9...then 0G)
- Front seam.
- Westinghouse liner 25.

It is more likely a Canadian surplus
- sweatband dated '51
- writing/identification numbers in liner. I read somewhere that was a common practice in the Canadian Forces.
- Purchased in Canada.

Anyone know the unit marking on the exterior? I feel it is post war applied (jiffy marker)
Have people had success removing these marks?

Regards,

[ruddersrangers44]

Nice complete Helmet which has seen very little service life,try useing acetone nail varnish remover with a cotton bud gently,agree Canadian stock with most likely un-issued US wartime made parts..................