Photo's I see if the K-3 show a dual scale (F and C) etched glass thermometer in the stainless guard.
Discovered a similar appearing thermometer with Fahrenheit only etched scale...
along with two guards without thermometer glass.

Were the K's partial or full immersion thermometers?
Did Kodak make their own Hg in glass tubes?

If no, does anyone know of the actual manufacturer?
Is there source for replacement glass, either spirit in glass or Hg in glass to the K series accuracy?.

What I am finding in the laboratory thermometer suppliers (NIST and ASTM rated) liquid in glass units are not in the
scale range of the K-3. More or less range but in the 300 - 305 mm (12 in) length arena.

Hate to see two nice stainless guards go to waste.