Seeking some help in identifying a Model 1917 bayonet marking

[22SqnRAE]

The 30 is the year I'm told....... and similar to our reissue dates, I've seen dates from 26 -30

BD,

As these blades were all made prior to 1918, and taking your guidance there, would you see the '30 (1930) as an inspection for back in service, or perhaps, first issue out of an armoury post WW1?

That's an interesting twist, something to consider.