40s or 50s? Towels

This is a bit of a silly thing, but I really want to get better at dating so....

I found these deadstock guest hand towels and my initial impression was 50s, but a few things make me wonder if they could be 40s:

• I have read there was a "Colonial revival" style that went up to the 40s
• The style of the font looks a bit older to me
• I feel like you often see that "Reg. U.S. Patent Office" notice on things from the 40s? Not sure about this one.

Any thoughts?

 

The label is a bit hard to read because it's shiny, but it reads "Novelty Decropak one pair hand towels. Reg. U.S. Pat. Off."

 

I found this in the "Official Gazette of the United States Patent Office", Volume 616 (1948):

 

Awesome, thanks! I did a web search on it and found nothing.

 

Thanks so much!