I use them if they are not worn out.
The Armstrong, Billings, Williams and Buffalo - Barcalo all await me finding the rest of the set in semi retirement.
I made a full range SAE set out of old mixed DOE and another I'm pretty sure all are Fairmount origin. The shape is distinct if you know what to look for.
The wrenches marked with only a number hold a secret, that number is a sizing system in most cases. I collect those too, I must have a dozen no. 27 as it was a common size for cars for a few decades and only one no. 21.