• All of the features of the previous, except:
• The frog receiver, in the bottom casting, now is y-shaped.
• Rosewood is re-introduced, and is often varnished so heavily that it almost obscures the grain.
• "STANLEY" is now incised in a vertical direction on the lateral adjustment lever.
• The original type study doesn't mention this, but on some of the models of this type "STANLEY" is stamped on both sides of the lateral adjustment lever. I've seen enough of these to convince me that's it wasn't accidental, or if it was, it was a big screw-up.
• The knurling on the brass depth adjuster is now parallel on most examples.
• Later examples have the familiar black paint on the hardwood tote and knob.
• Type study doesn't mention this, but the cutters now have rounded tops instead of the angular top. This change happened in the mid--1950's, in my opinion.
• Furthermore, the original type study doesn't mention the change in the finish applied on the forked lever. For a short while, some models had a nickel plated appearance on them as a finish rather than the usual black japanning. Where in the sequence of actual manufacturing this subtle change fits is unknown to me, but I've only noticed it on those planes equipped with rosewood knobs and totes and rounded irons.

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