Hey guy's... and gals. I have done my best to value my coins by looking at factors of each coin in my sixpence collection. Each coin is pretty good condition. They are not high grade but the are almost uncirculated with the exeption on two coins that are in fair condition. I have 1 sixpence for each year Queen Elizabeth II was on that coin. So all together there are 15 coins. So by good grades and the year of the coins being my main factors I estimated this collection at round about £54.50. Does that sound acurate?
The value of your 15 sixpences is about £1 in total. They have little numismatic value and no silver content. Most are sold for use in vintage slot machines or as lucky wedding gifts. See here for a guide to British coinage http://www.coins-of-the-uk.co.uk/values/sixd.html