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I think its a 3.7" HE proj.
This is a 4.5" echo(same profile as The HE).note overall dimensions,4.5" is more slender/longer in appearance and the driving band on your proj. is classic 3.7" pattern. 4.5" band is very different profile.
cheers Bob
Pete any chance of a definitive measurement of the calibre please ??
Kahu1 you do have a point about it being a 3.7", it will be interesting to see which calibre it actually is.
I only ever had one fired and extreemly mankie 3.7" HE projo and there was not enough of the band left to see what it was like so I only speak from memory of my old 4" inch projo..
You are correct with the FS meaning,other options would be CS for 'cast steel' or BS for 'bored from bar'.
Info from 'HANDBOOK FOR ORDNANCE,QF 3.7NCH MKS1 ,2 AND 3, LAND SERVICE,1939.
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