1200?
http://cgi.ebay.co.uk/20p-20-pence-d...0#ht_500wt_931

i can remember my sister going through her pocket money when the dateless ones came out, and going 'this 20p has no date on it' we all just nodded and werent really interested, so she went and spent it at the shop. about a month later we found out there value lmao. pretty gutted.