Coleman 242B

Hi all,

Struggling with this Australian made 242B and dating it, I've attached three pictures of the same fount from different angles, and I can't decide if its 51 or 61, number on the other side is 1. Would be early if its 51 from what i've read.

What do you all think?

 

Sharp top edge so looks like a 5 .
Probably need to compare it to a clearly stamped 5 or 6 on an Australian Coleman lantern.

 

In my opinion, it's 51.

 

51

 

looks like 51 from here Andrew ?

 

PS I have two both from 1951 so not uncommon.