All but one of Citizen’s ‘bullhead’ models, with the 8110A movement, were mounted in ‘base metal’ cases, albeit with stainless steel backs. Some were gold plated or black coated. The only one to use a stainless steel case was the 67-9356 model – and not only was stainless steel notable, the octagonal case shape also gave it a unique look. With either white or black dials, they also feature a larger crown than other 8110A models:
See the Chronograph Page for further information: https://sweep-hand.org/citizens-vintage-chronographs/
Sweephand's Vintage Citizen Watch Blog 
Hi! Recently I received as a gift a Citizen vintage watch and in my search for information about it I’ve found your blog. It’s really interesting and has already help me to figured out so much about this watch, but I was wondering if you could tell me a little bit more about it.
It isn’t a wristwatch and there isn’t alot of information available, as far as I could find. It’s hand winding and it could be a pocket watch, or a necklace watch, since it’s kind of small. Do you know if Citizen ever made this kind of watches?
In the back it says:
PARA WATER
START
S.S
HOOS-2001-K
8032618
In the front says:
Marine Star
CITIZEN
Japan 1701-1K
Also in the front the numbers are roman numerals, the center its dark blue, with a circle around it of black and white stripes. I don’t have a picture right now, but I will try to upload one.
Thanks for your help.
Hi Alzilei, thanks for visiting my blog. The watch you have is an unusual model, but Citizen did make small pocket watches. The ‘Marine Star’ marking is something I don’t recall seeing before, so I’d very much like to see a pic 🙂 You can’t post an image directly here, but if you upload a pic to something like Photobucket then you can post a link.
The markings on the back all seem authentic – is it ‘STAR’ rather than START? STAR is used on cases up to the end of the 1960s. The model number – HOOS-2001 – is a valid one, and indicates that a ‘Homer’ (02) movement is inside. Given the ‘parawater’ mark this is a pre-1970s model – so I would think it’s March of 1968.
The dial sounds unusual – it’ll be great to see a pic 🙂
Stephen
Yes, indeed it says STAR, not start. 😛 Thanks for your reply, I don’t have an account in anything like photobucket, but I have posted a few pictures in my twitter account, you can see them here: https://twitter.com/alzilei/status/496354845738414080/photo/1 and here: https://twitter.com/alzilei/status/496355111632121856/photo/1 Again, thank you for your help, I’m very excited about this watch and knowing a little bit more about it makes me even more so. 🙂
Hi Alzilei, thanks for the link to the pics 🙂 Firstly the case looks correct – do you know what size it is? My example of a Homer pocket watch measures about 43mm wide.
Stephen