From the list I found on the internet it should be from 1958. A date should be noted on the bellow ( production date of bellow, might be a little different from the date of the clock) but I wouldn’t open the clock just to check the date.
I have serviced this clock, and changed the suspension spring some time ago.
I neglected to look at the bellow while the bellows. Could yo please send me the link you used on the net, it seems more accurate the the one I have found which is quite generalized, and only says made in the 50,s.