Correct . I know because they have the NRA emblem indicating late 33 or 34. The Gem blades that came with this set say "Colgate-Palmolive" on the wrapper.What a wonderful "gem" you scored @jmudrick !!
I wonder if the Star blades were originally part of the set instead of the famous Micromatic "Doubledge" blades that came out that same year.
EDIT: I've read the Adquisition thread and now I know those Stars are from 1934
I've tried nearly every SE blade marketed for shaving, and the Gem PTFE is my clear favorite. Welcome to consistent & wonderful SE shaving.
...and fit a heavier modern handle on it. Easy way of joining a M5 handle to a 1912 head is to use a British 2BA thread. I buy 1" brass screws off eBay.uk and saw the heads off.