What means R.L.B.?

[spotter]

Tonys books available to order here..
http://www.whsmith.co.uk/whs/go.asp...9fd9f77a2611f4c7fc031acdca22&affId=320460

and here
http://bookshop.blackwell.co.uk/jsp...p;term=0953295281&source=3143451408-21103

 

[Defender]

Many thanks to all who'd answered!

Tonys book is ordered and I think it will help to solv some more probs ...

 

[Chris 42 RQ]

R.L.B = Royal Laboratories Birtley, found on a large number of cases and large projectiles.
I believe their product range was from 35 mm to 8" inch- i believe 8" inch production ceased in the early 70's.

Hope this helps.