I asked the seller of my guitar how they are sure the date is 1955.
Their reply :
Regarding your remarks, regarding the serial number first of all,The guitar is indeed from 1955, because its serial number is engraved on the back of the head and not only printed, moreover the first digit of your number is 5 which corresponds to the year 1955 (see table attached).
I really don't know if this is correct ?
thanks, Dirk