Hi Dave
The answer is yes, as we hold all the dating records from Ransomes.
Your machine is a Ransomes Marquis 20 Inch model MK 4A, The 4A started production in August 1967 and ended in March 1974,
Your machine carries a late number which was built in the factory in late December 1973, which would have been sold new into the spring season in 1974.
Hope this information helps
Regards
Andrew