Hi Gwen.
I think I have found Malmen 421A in Oskarshamn for you. According to Oskarshamn municipality's homepage the old market town was divided into six parts: Malmen, Småland, Vikingen, Herkules, Najaden, Neptun and Triton when it was mapped in 1845 with lots numbered from 1 to 435. Malmen covered the hilly areas north of the harbour and the stream Döderhultsbäcken.
On the site historiska kartor.se I found a town map of Oskarshamn from 1887 complete with house lot numbers.
http://historiskakartor.lantmateriet.se/arken/s/show.html?showmap=true&archive=R EG&nbOfImages=352&sd_base=lm08&sd_ktun=0002oj5y You'll find lot 421A on the third image, with one house on the corner of Borgmästargatan and Kalmargatan and two outbuildings at the back of the lot. I'm not sure that the streets had been built yet as both neighbours had houses pencilled in outside of their lots. The shoreline is also pencilled in way above the present Strandgatan.
Today the parts of Malmen where your family lived is an industrial estate, the buildings on Google street map are built in the style of the early 1900s.
(Meddelandet ändrat av linlib 2013-07-25 16:49)