Antiques slideshow - a silver dial barometer and a 17th century portrait of a woman

Item one: Girl with St Bernard dog, mixed method engraving, proof on India paper signed by artist and engraver Charles Burton Barber (British, 1845 - 1894). The work of Charles Burton Barber is well liked by collectors of dog art and is still very collectable. The condition here is a problem: traces of staining, watermarks and foxing reduce value and desirability. Could be restored, but it would be expensive. Value: £50-80 Photograph: Michael Smith

Item two: A mahogany and brass mounted wheel aneroid barometer with engraved silvered dial.  Made circa 1840-1860 and often imported from the continent. The engraved house on the dial might depict the owner's ancestral home. Because these are common instruments, prices are usually less than £200, but good signed Georgian examples usually make high hundreds. The excellent condition and interesting provenance of this barometer could beat the usual low prices and fetch £400 - £600.  Photograph: Mary Sayers

Item three: Folding map of Surrey on linen, hand coloured engraving, published by James Wyld (1812 - 1887), London. It comes with the original cloth slipcase with publisher’s label inscribed for collector Edwin Martin Atkins. But this is not an uncommon map and currently undervalued. Could fetch £60 - £90 but worth hanging onto or even buying at this stage. Photograph: Stephen Bound

Item four: A pair of ebonised wood and chromed steel easy chairs, with roll cushion backrests upholstered in white leather or vinyl, probably Italian. Appear to be from early 1970’s. The low, sleek forms and the roll cushions are reminiscent of the designs of Joe Colombo and his contemporaries. An attribution to a known maker or designer would certainly raise the value as these are very stylish pieces. Check the underneath and even inner construction for potential labels, stamps or reference number.
Value: £1,000 - £1,500 Photograph: Rowan Blades

Item four: Oil on canvas portrait of a young woman. Could be by Nicolas Regnier (1590-1667), who trained in Rome and settled in Venice. The image could be possibly of a saint. With a strong old master market, a painting of this type would be highly sought by both trade and private buyers. A fine example of 17th century art.
Value: £10,000-£15,000 Photograph: Virginia Lopez