Sole (in this case a double sole) stitched with a square awl at 10 stitches/inch.
In central Europe, where everything is stitched with a round awl, stitch length never seems
to go below 1/2 'Paris Point' (3.3 mm) which works out as 7 1/2 spi.
Good photo of a square awl and in use, too.
I didn't know that about Paris Point being a standard for outsole stitching in Central and Eastern Europe. Some of what I've seen looks more like five to the inch.