Tankers Helmet with only a "7" marked - Original?

[waugust]

Helmet looks old enough except it is marked with only a size 7
Is this original US issue ?
Thanks for looking

[visor]

Here is one from the guild that just sold.

[MAP]

Looks good to me. Rawlings and Wilson made these. They are M-1938.

Check out this link.

M-1938 tanker helmet

Regards

Michael