This is one of 11 examples built of a standard design from Germany's Busum Shipyard. Two of these were built under subcontract by H Brand, at Oldenburg.
Per Henriksen's Mercandia took four of them, three built at Busum: MOON, STAR and SUN, plus SKY from Brand's yard. This one's subsequent history is as outlined by Derek.

All sources indicate that this vessel was Midia the Antigoni was ex Mercandian Moon and had a twin funnel to, see here
http://www.werftarchiv.de/41d845860083df8ac1ca73af485c4431/deutsch/schiffsdaten/schiffe_der_buesumer_werft_gmbh/mercandian_moon_-_mehrzweckfrachtschiff_-_bau_nr._264/index.html

rgds
Derek

This vessel was not the midia, she was the antigoni, for the same owners/operator which was gulf line of ipswich. the midia was also ex mercandian line vessel but single funnel, otherwise similar, i sailed on both vessels