This is the POLAROID 636 CLOSEUP.
It's the successor of the 635 CLOSEUP from the so-calles "curved
corner" series, also marketed under the "OneStep" name. This one has a
sliding plastic lens which can be put in front of the main lens for a
focussing range from 60cm to 1.2m. There was a second, more colourful
version (see further below).