Maxime D., have you had any luck in dating Krona DE shaving razors?
Good info. The last of the Krona razors were packaged and sold in the bicentennial sets? Has anyone ever determined if they were NOS or did they do a final run for that year?
I agree with you about the 1966 Metal Knob version as I've seen some Eversharp Krona with M-66 on the packaging. My bet is that The Smooth doors + plastic knob was a transition between the previous version and the newest one, they probably had a stock of smooth doors left over and used them until the 'SCHICK KRONA' ones.
I took pictures of the Gold Krona Executive Booklet:
There is, at least to me, a marked difference between the Schick Stainless & Super Stainless with Comfort Edge. The latter being a fantastic blade & the former less so. They did something to the coating obviously. Vydax?