Interestingly, we featured an Erstwhile map at the end of 2013. The downside being that it was only available in Australia (unless you happen to live in Australia, obviously). However, we've just noticed the Erstwhile vintage maps and charts at Achica, which means they are available in the UK – and discounted.
1930s ‘Great Britain, Her Natural and Industrial Resources’ map from Erstwhile Maps
If you like your artwork to have an educational flavour, as well as something that looks good, check out the selection of maps and charts available from Erstwhile Maps – a favourite being this 1930s 'Great Britain, Her Natural and Industrial Resources' map.