This is one of my pattern maker's planes. (The other is pictured here). It has eight soles and eight Stanley Sweetheart blades.

Side view

Screws in the soles engage the keyhole slots shown here. One is near the knob, the other in the front of the tote.

The bottoms and blades from left to right are marked 15, 12, 8, 6, 5, 4, 3, and 2.