Can anyone explain/identify these marks on My WW2 dated No36 gren please....

[Edwardc]

Its a No36 gren made by Kenrick. I have found these marks on it and wondered what they mean.
Sorry for the large sized photos

First mark is this one between the filler screw and the striker hole. is it 31 or 37 or 3J?

Next mark is in the recess in the body of the gren, where the striker handle sits, at the bottom of this recess (does that make sense?). Is it a 7 or a corroded Z?

Final mark is at the top of the striker lever recess, between the shoulders of the lug bits..... Is it 22 or SS or ZZ or combinations of that?

Any suggestions? I have only guessed what the figures or marks are and I havent a clue what they mean, anyone able to help?

cheers!

 

[millsbomber]

Well the last 2 pictures are the Mold numbers, i don't know about the first picture marking, looks like it was stamped,,, well spotted nice pictures too........ Dave