did a bit of quick research. makes it appear these are genuine, and are from pre-1850?
Jameister
Holland & Holland
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Holland & Holland are prestigious British gun-makers of hand-made sporting rifles and shotguns, holding two Royal Warrants.
[edit] History
The firm was founded by Harris Holland (1806-96) in the year 1835. He may have had a wholesale tobacco business in London. Whatever his source of income, he was often seen at live pigeon shoots around London, as well as shooting grouse on a moor he leased in Yorkshire.
Recognised as an accomplished shot, he was convinced to start his own gun-making business. At first the guns bore the inscription "H. Holland". It is not known when Harris started his own manufacturing operation, but it is believed to have been in the 1850s.
Having no children of his own, he took on his nephew Henry, also a Holland, as an apprentice in 1861. In 1867, Henry became a partner, and in 1876 the name of the firm was changed to Holland and Holland, although his uncle still kept a tight rein on the running of the company.