Thank you. Lotta’ grime, but little rust on the rims. I’ll be looking for those marks, today.Those rims aren't very rusty on the Hercules. They may be stamped what they are. Dunlop rims will have the size of 26x1-3/8" or 1-1/4" And then Either EA1 or EA3 . EA1 is 597 ISO and if the rims are original, may actually be the size considering it looks like a pre-war bike. EA3 is 590 ISO and the front tire looks like some 590's Ive had.
Interesting to note that there was an American Hercules Bike of this era made in Cleveland (considering the Miami)
This one looks to be English though.