Welcome. It is neat that you have the manual. Do you have some attachments for it? Also are there any needles for it? From my understanding, these machines take a different needle than modern domestic machines take.
According to
https://www.janome.com/siteassets/su...anufacture.pdf it would indeed be from the 1940s, probably near 1942 or 1943 if they were sold fairly equally between 1940-1946. It appears that there is a model ALB that tooks quite similar to your model ARE.
Janey - Neat people never make the exciting discoveries I do.
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