As given by Navicula and Watercraft Philately built in 1959 by Ferguson Bros, is wrong the shipyard never built a ship under that name, as given on the shipyard built ships. (is one line)
As given by http://www.miramarshipindex.org.nz there was a KURUPUKARI under the flag of Guyana but built much later, the stamp depict a more modern vessel as built in 1959, and I think she is depict on the stamp.
She was built as a ferry/ro-ro by the yard of Friendship Marine Ltd. in Guyana in 1974 for the ?
Launched as the KURUPUKARI, named after a settlement in the Essequibo region.
Tonnage 116 tons, Dim.?
Power ?, speed 10.5 knots.
Passenger 500, 23 cars and 10 commercial vehicles
1974 Completed.
Fate unknown, maybe still in service.
Guyana 1983 30c sg1127, scott 342