Manufactured from 1959 to 1961. Similar to the Retinette I this model had a simpler "V" shaped chrome pressed metal lens/shutter mount. The camera has a Reomar 50mm f/3.5 lens in either a Pronto or Vero shutter.
This is the earliest variant, the later type 042 and 044 were very similar but were fitted with a the shorter, but faster 45mm f/2.8 Reomar lens.
The Retinette 1A must have been a very popular model, certainly they make up the vast bulk of the Retinettes I see these days.
Here is a link to a copy of the Retinette IA instruction manual on Mike Butkus' excellent website.