Dating Troxel Seats

[srfndoc]

I have two prewar long spring Troxel seats on two different bikes. The first is 10" wide, has springs with a width of about 2" at the base and the following logo:




The second Troxel seat looks very similar but is slightly less wide (9.5") and the springs measure 1.75" at the base with the following logo:




Any idea on how to date the year of these seats? I'm guessing the first one is a bit older by the logo but that's just a guess.

Thanks!