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.505 Gibbs Rifle Brass 'H H' Headstamp: Maker and Quality Info Sought

This .505 Gibbs brass, used in belt-felt .50 caliber rifle ammunition, is headstamped "H H." Do any Guns & Ammo readers know the origin of the stamp?

.505 Gibbs Rifle Brass 'H H' Headstamp: Maker and Quality Info Sought

Question: 

I acquired quite a supply of .505 Gibbs brass about six years ago and hadn’t looked at it in some time. Recently, I asked a buddy (that I trust) to handload some of the rounds. I thought, by memory, that they were Norma and Bertram brass, but he said that many were headstamped “H H”, and that he had gone ahead and loaded them. He was unfamiliar with this branding and thought I ought to check. I have now consulted several references, and cannot identify the “H H” head-stamp. Can you help me identify the maker and quality of this brass? It appears high quality, but before I touch one off, I’d like to be a bit more...

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