6S/1240.

Is this on a data plate? If so what else? Drawing number, issue level, inspector etc.

Supermarine built Spitfire fuselages and firewalls have 6S/ followed by six numbers.

Mark

No its on a spar….end of a wing spar….just bleakly looking for a serial number I can use on my cockpit project with extra thin but slightly robust provenance!! I have a huge chunk of wreckage from a (currently) unknown Spit including carry thrus and wing spars. Just would rather that the project (using 35-50% original structure) had a tenuous id instead of being anymouse!:)