Can anyone confirm these are mainsprings for 60 hour Illinois watches. Would they be for Bunn specials or Sangamo or either.

Robert
The book I have lists the 60 hour as 21 x6 3/4 x 27, it states 13th, 14th, 15th models all 60 hours.

It is the only mainspring I show listed for Illinois 60 hour watches so I would say if it is a 16s Illinois 60 hour it takes that spring.

The one I listed is the closest in size to the one you list.

Hope it helps.

Tom

Rob (young man)yes they are 60 hour springs .

Thanks old man I didnt want to list them as so if they were not. Do you know if they are for the Sangamo or the bunn special or either

Rob the 60 hour Bunn special &60 hour sangamo special do use the same spring.

Thanks old man you need any