51 N was issued in October 2000, when it was sold for £9000 by the DVLA.
None of the reverse series plates (ie: with the numbers before the letters) were issued before the mid 1950s, and they continued to be issued by some licensing authorities up until the mid-1960s (even after the suffix-style plates were introduced in 1963).
This site will tell you when/where (or whether) a plate was issued:
Numberplates.com: When and where was your number plate issued
and you can check whether a plate has been sold at auction here:
Previous registrations search. Searches previous style registrations
Great post. I am having lots of fun going through these websites.
I have seen a couple of plates that I like,not too expensive either.
One small problem though,I have my existing number etched on all of my windows............................
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