Silver Hip Flasks
A sterling silver hip flask, handmade in Brentwood, Essex to the exacting standards of Master silversmith John Campbell. It encompasses a bayonet cap which remains attached with a hinged facility ensuring the cap cannot be dropped or lost. The front has a plain rectangular area which is suitable for engraving. A small sterling silver funnel, to enable easy filling, is also supplied with the silver flask.
Our manufacturing process is described below.
The flask is made from 7 components, 3 sheet items and 4 cast items. The funnel is a separate spinning.
The body: a strip of silver sheet is cut to size and bent over an oval cylinder. The joint is brought together and held tightly with 2 iron binding wires. The joint area is then fluxed, made red hot, and silver solder applied to it. This is then allowed to cool down and 'pickled' in dilute sulphuric acid to remove flux residue and oxide. The seam is then dressed down with a file and a brass former is pushed through the cylinder to create the perfect oval shape. The bottom plate is then soldered on, followed by the top which has a hole cut into the centre. The overhanging edges are then filed back and dressed.
The cast cap: The cap is cast in 4 parts, the hinge, the bayonet ring, the top ring and the rotating knurled cap. These parts are all cast using the 'lost wax' method by BAC castings. A master pattern is made of each component which is 12% larger than required. Molten wax is injected into the mould and when cooled and solidified is removed. Several of these wax copies are joined onto a wax stem called, and looking like, a tree. An open ended steel cylinder called a 'flask' is placed over the waxes and the void filled with liquid Plaster of Paris. Once his has set, it is heated and the wax melted out. The flask is then heated further to 1200 degrees C to burn off all wax residues and then cooled to 400 degrees. At this temperature a measured amount of molten silver is spun into the flask with the aid of a centrifuge. Once the flask has cooled to 200 degrees it is plunged into water which causes the plaster to disintegrate. The cast tree is then removed and water blasted to remove the plaster remnants then 'pickled' to remove oxides. The castings are then cut off the 'tree' and the base reused for the next casting. The cap complete assembly is then tried and tested for functionality and the hinge to work. The lower part is then soldered to the top of the flask body.
At this stage in the making the item is sent punched with the makers mark, JAC in a triangle, the full initials of John Archibald Campbell. It is then sent to the London Assay Office for testing of each and every component. Only if all the components prove to be better than 92.5% silver are the remaining hallmarks punched into the surface while being supported on a steel stake. The English hallmarking system is one of the oldest and best forms of consumer protection and dates back to the 1400s.
The item is then returned to the silversmith's workshop where it is polished using 4 grades of compound to remove all the spinning lines, file marks, blemishes and scrape marks caused by the Assay Office tests. It is finally polished and packed into fitted presentation boxes.
An essential accessory for the discerning outdoor person who likes to carry a little of their favourite tipple when on a walk, a hunt, golfing or at the weekend game. If you are looking for a silver present for a man then this will fit the bill.Silver has become a subtle status symbol in recent years.
Be assured that all JA Campbell products are made up to a standard and not down to a price. In the unlikely event of damage, we provide a full repair/replacement service. 'To delight a customer' is something Designer John Campbell aims to do with every item that leaves his workshop.
The silver hip flask is available in 2 sizes. 9cl and 15cl.