I ask yours opinion on my two helmets ADRIAN Polish, M15 and M26. The M15 is engraved on the shell, lower part back, what could be the last name "Goldstein" and the M26 on the chinstrap has written the name "Robert Girardin." The frieze of the two helmets is very similar, but that of the M15 engraved with the initials "WP". I think the helmet M15 goes back at least to the 20's and the M26 is the WW2 period. Thank you, best regards. Giovanni
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