Joe - thanks for the reply.
The coin you have referred me to is similar - however the emperor on my coin looks younger & the headgear looks a little different.
I have done a little 'googling' and came across a coin which looks identical. I'd better not give the link as I think they are competitors to this site.
The information with the coin is:
Ref Trajan AE Sestertius, RIC 628, Cohen 164, BMC 966
TRAJAN Æ Sestertius. Struck 113 AD. Laureate bust right, slight drapery on left shoulder / Fortuna seated left, holding rudder & globe. Cohen 164.
Looks the same to my untrained eye - but doesn't give any explanation of inscription meanings.