I'm going to guess that you know the dating method from seeing Sweephand's combination movement table & dating guide. If you don't already know the link to his blog, here it is:http://sweep-hand.org/
I would hate to try to guess decade on this watch not knowing the movement (& not being an expert on all their many models). So ...
I'd suggest you get onto his blog & send him the question. I'd say he is capable of telling you!
Now, if that doesn't work, there's another blog & the owner may also know the answer:http://vintagecitizenwatches.com/
This 2nd guy also has a vintage citizen watch group within Facebook as well.
Good luck with getting the answer