Genuine Dunkirk DLS?

[Alpha22]

http://www.ebay.co.uk/itm/WW2-DUNKI...kt=4&clkid=8178838610638341483&_qi=RTM1793568

Genuine 1940?? or home made bunting?

I don't recognise the pattens and colours, but I wasn't around in 1940. Have signal flags changed much in 75 years?