Leather Case, Military I.D. Quiz

[guyvapeur]

I have acquired over the years a number of leather cases.

The first two photos show a leather case measuring 4x7 inches by 10 inches deep. It has HELIO 5 " MK.V / F LTD. written on the front. I have been told that this may be for the Mk V Heliograph used by the Canadians up to the last World War. Based on internet queries, this is quite probably so.

The last two photos show a leather case measuring 6.5 inches square by 16 inches long. I has three straps and is all leather construction with no partitions within. It has ROBCO LTD / MONTREAL / 1942 written on the front right panel along with the big C and Broadhead.

Any clues as to what the last case might be would be appreciated.