This turns out to be a interesting thread.
As my back ground is in shipbuilding I just was learned a lesson
about the history of refrigeration ships.
I found an PDF from 160 years of South African perishable goods.
- They shipped grapes to UK before WW2.
- Exports ceased 1941.
South african fruit exports
I have no details on transit times but i think about a month.
I do not have knowledge of the harvest months of the kind of grapes suitable for refrigerated ship transport.
But this could detail the year.
SLB
So this could detail the year.