I had (probably still do have in storage somewhere) a Seagull 203. When it was good, it was great, but it was never entirely predictable. Sometimes the focus would just be off a little and you'd get an unplanned, unpredictable soft-focus effect. Film advance is lever-wind via red window, and it could take either 6x6 or 6x4.5 images using a built-in set of masking doors in the film transport chamber, which would lock the entire roll into one format or the other. IIRC there were bright-line markers in the finder for 6x4.5 composition. Mine developed a mechanical problem with the film advance - the advance lever now just slews freely and doesn't turn the film. I suspect a screw or two have sheared off and it no longer engages, or else a gear self-stripped somehow.