No doubt other assets....
IMO still looks like the one date is larger than the other when looking at each digit - see for example the top stem to the "6".
For 1964 . Groom has 2 reverses , a reverse F with a calm sea , similar to the 1963 , and a rev G which has a choppy sea .Also noted are 2 parralel lines in the exergue to the left of the date , short helmet plumes and missing waves .
Probably not... with one possible exception - Dave Groom. If you have a copy of his bronze 20th Century varieties book (I don't), he may have covered this.
On a more serious numismatic note:
Could this Aethelstan penny be proof, that Humpty Dumpty did, in fact wear a syrup?
Moneyer; unidentified (but the case is still open).