Bronica Sq Serial Numbers

I just bought an SQ-A and was wondering if it is possible to tell the camera's year of manufacture by the serial. Serial numbers. Bronica and have. Bronica also Zenza Bronica (in Japanese: ゼンザブロニカ) was a Japanese manufacturer of classic medium-format roll film cameras and photographic equipment.
On Thursday, June 11, 1964, a U.S. Federal trademark registration was filed for BRONICA by, ITABASHI-KU, TOKYO. The USPTO has given the BRONICA trademark serial number of 72195484.
The current federal status of this trademark filing is EXPIRED. The correspondent listed for BRONICA is of MARMELSTEIN & KOBOVCIK, SUITE 912, 1725 K STREET, N.W. WASHINGTON, DC 20006. The BRONICA trademark is filed in the category of.
The description provided to the USPTO for BRONICA is LIGHTERS FOR CIGARS AND CIGARETTES. Why is this contact information displayed? The USPTO makes this data available for search by the public so that individuals can locate ownership information for intellectual property, much the same way a county might make real estate property ownership information available. Since our website is synchronized with the USPTO data, we recommend making any data changes with the USPTO directly. Onyx Postershop X10 Crack. Our website will auto-update when the USPTO data is updated.
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Not a Pentax question, but I'm hoping someone here will have some insight. I posted at APUG, but thus far no response: My first MF camera, a Bronica SQ-Ai, was purchased late last year from KEH. I have a lot to learn about it!
Recently, I decided I wanted an eye-level prism, mostly to be able to focus accurately and compose at the same time (as opposed to using the spring-loaded diopter in the WLF), but also because it's nice to have a laterally correct image. So I went back to KEH to see what they had. I couldn't afford a metered prism, but figured that wasn't a huge deal, as I could use another camera or an old Weston meter I got recently. I noticed that an AE prism with a 'non-functioning meter' was listed cheaper than a non-AE prism, so I bought that. I guess I got lucky, because the prism I got seems to meter just fine!
However, after being on the camera for a couple of weeks, it drained my batteries. I Googled, and found a few people talking about needing to turn the prism off when not in use. As far as I can see, there's no way to turn it off. There's just one big silver button which seems to activate the meter, and then a switch on the shutter speed dial, the purpose of which I cannot discern. I'd love to be able to find a manual for this prism, but I don't even know what it is. If anyone could point me to a manual, or at least give me the official name/model number of the prism that would be awesome.