2 cleartop 400 watt westy lifeguards, one of which I will get in a trade. My question is, if anyone can date by etch, which one is older and what is the exact year?

The H33-1-GL/DX is definitely older since it was made before the 400w lamps were called H33GL-400/DX as they still are. If I remember correctly it’s likely from the 60s to around 1972/73. Unfortunately I don’t know the exact dates from the etches though, I’m sure some other members do.