British MK.IV camo painted. Original?

[11thArmoredThunderbolts]

Hello, I have had this Mk. IV helmet for a while now but I am not sure if the camo paint job on it is original or was done by some kid. Helmet is 1945 dated but painted black (done in 50's). Over the main black paint is splotches of green and brown. Also there is a odd decal that says "AUS" and whatever was below it has fallen off. Any thoughts would be appreciated, thanks!

[11thArmoredThunderbolts]

Under some of the scratches I can see a light green paint. Any ideas anyone?

[Jerry B]

Many MKIV's seem to have lasteded in service until the 1980's, that's 40 years of use, then storage, then reuse, then back into storage then used yet again, hard to decide on when and why such helmets were repainted.