Nothing I can see w/o looking closer in person! I can give you the correct WaA codes/inspection marks if you wish to double check the serial numbers. They should be 214 maybe some 26 parts as this number was used until 1938. Always a chance of couple different numbers, contract parts you know, then you must depend on serial number font being the same.
These numbers were assigned to indiviual officers who were in charge of the area inspection district. Inspected many war industries in that district. They kept these numbers as long as they had the job and took them with them when transferred to another district. Of course all the inspectors who worked under him used that number also.