Reply by Caydel

Updating with further info from http://www.recordhandplanes.com/dating.html

1. It has the first (flat top) profile on the cutting iron and chip breaker which dates it to the mid-’50s at the latest.

2. It appears to have the Chromium finish, which puts it at 1940 at the earliest.

I’m not really sure what you mean by the lever cap having a screw or ‘Bailey Style’. I’m not that familiar with Bailey planes, but it has a screw sitting in a keyhole type cut in the lever cap.