English Civil War Period Lobster Tail Helmet or ‘Dutch Pot’ c.1640-1650

English Civil War Period Lobster Tail Helmet or ‘Dutch Pot’ c.1640-1650, one piece skull embossed with 6 radial ribs surmounted by an iron suspension ring, 4 lame articulated neck guard with turned over edge, fixed peak with turned over edge deeply struck with armourer’s mark and the letter I, sliding adjustable nasal bar with swollen finial secured by thumb screw and staple, ear flaps pierced for hearing (leather suspension straps replaced), good age patina overall.