Brass Plugs for Fuzes?

[ron3350]

I have 2 solid brass plugs for fuzes or ordnance that I cannot identify.

1" 1M plug . Who is TJR , What does 1M mean and what item was it used on?
14 TPI, 30mm head, 22.4mm diam, 25.4mm thread diam, 55.8mm long.

Second plug No3 is also 14 TPI and has 1M. What does it fit?
S.H&S is Samuel Heath & Sons Ltd, Birmingham.
39.5mm head, 31.5mm diam, 34.5mm thread diam, 43.5mm long.

 

[Hoeksel]

TJR is for Richards Industries Ltd., Adelaide, Australia.

 

[ron3350]

Excellent information Hoeksel.
It seems that I have to rely on overseas collectors to identify an Australian maker for me when I should know them myself.
Here is information from the web about the company name changes .
It says 1941 was the change to Richards Industries Ltd and that is good enough for me. Thanks.
Now I need to know the use for this plug and the M1 meaning.