There's a new departure for the Cotswold Auction Company in Cheltenham on July 7, when a sale of modern art and design brings evening trading to Chapel Walk for the first time. John Elwyn (1916-1997) is one of those Welsh painters whose reputation is more than secure, and while the auctioneers have put an estimate of £1,000-£2,000 on this craggy view, it could well leave that kind of money far behind. The Welsh contingent will doubtless be also out in force when a charcoal sketch of Three Cliffs on the Gower by Ceri Richards, dated '68, looks good enough to sell for £400-£600.

This massive Mercedes Benz limousine is estimated at £8,000-£10,000 at Charterhouse's auto sale at Sherborne Castle on July 19. "The vendor, a garage proprietor, bought it second-hand in 1960 from Brooklands of Bond Street," says auctioneer Matthew Whitney. "It was last on the road in 1973 but has been dry stored since then, Waxoyled underneath and covered in oil and grease to preserve it, and its engine was started regularly to keep it in trim." The Mercedes was an extremely rare sight in post-war Britain, and only 42 of this model were produced with right-hand drive. In Germany, these cars were known as Adenauers, as the country's first Chancellor was never seen in anything else. More than 17ft long and six wide, it is imposing with its black coachwork, maroon leather upholstery and white-wall tyres. More impressive for the buffs, however, is the 3,000cc six-cylinder engine, which turned out 123hp and was later developed into the legendary SL300.

A fine collection of Moorcroft is to be sold at Lawrences of Crewkerne of July 9. Put together in South Africa by a couple who moved to the Wells area last year, it offers several substantial pieces in patterns that include Pomegranate, Cornflower, Spring Flowers, Poppies, Pansy and Leaf and Berry. Also on offer are early pieces made by William Moorcroft at the Macintyre factory 100 or so years ago, and estimates range from £500-£2,500. "Moorcroft remains extremely popular, and it's rare to see so many large pieces in such good condition," says Lawrences' decorative arts man Simon Jones, seen here with some of the choicest lots.

When we think of the Paris-based Romanian sculptor Demetre Chiparus, we rarely look beyond his glamorous Art Deco dancing girls, but his output was far more varied than that. Dreweatts 1759's decorative sale near Newbury, on Wednesday, includes this pert little schoolgirl in silvered bronze and ivory, with a quite modest estimate of £600-£800. Watches include a Rolex Oyster Perpetual Submariner 300m (£1,000-£1,500), while a Carlo Giuliano Renaissance style brooch in gold, sapphire and enamel, c1880, looks opulent enough to go up to £4,000-£6,000.

Three lots of Bristol interest are in Bonhams' sale in Oxford on Wednesday, sent in by Patrick Toynbee at the company's office in Bath, which now supplies the Oxford and London salerooms. Seen here is James Baker Pyne's small watercolour of the Avon Gorge with Cooks Folly, signed and dated 1841 (£600-£800), while another Bristol School signed watercolour from the same house in the city is Samuel Jackson's St Augustine's Parade, Bristol, which carries much the same expectations. Finally, from a house in Clifton, a William IV twin-fusee carved rosewood mantel clock with an arched silvered dial signed Geo Muston, Small Street, Bristol could go up to £1,500 if it strikes lucky on Wednesday.

A second-issue dust jacket on this first edition of Casino Royale deprives it of the kind of price expectations that will have you dropping your toast in your cornflakes this fine morning, but Dominic Winter still expects it to go for £4,000-£6,000 at his sale of children's and illustrated books and modern first editions at South Cerney on Thursday. Published in 1953, Casino Royale was Ian Fleming's first James Bond book, and this one is in very decent, collectable condition. The novel had been so well received by the Sunday Times that the publishers had the bright idea of printing part of its review on the jacket just as soon as they could – which was good for sales then, but now, more than 50 years on, means the book is worth thousands less than if they had left well alone. In a busy week, Dominic Winter is offering maps, photography, travel books, manuscripts and theatre memorabilia on Wednesday and paintings and prints on Friday.

Chippenham Auction Rooms' specialist sale of advertising and enamel signs on June 27 includes this Fry's Five Boys shop-counter change tray, in exceptional condition for its 100 or so years (£600-£800). So when did change trays die out? These pages can look back well over 50 years, and we have no recollection of anything remotely like this. On the contrary, where we lived, we reckoned shopkeepers were out to fiddle, diddle and swindle us, rather than lay out our pennies and ha'pennies for all to see.