Pentax M42 mount film slr spotmatic camera의 사양과 시리얼번호 확인법

짧은 영어로 대강 번역해 보니 spotmatic의 초기 시리얼번호는 10xx800번으로 시작하였고, 201600번 보다 낮은 시리얼번호는 초기 제품(1964년 부터...아마 1960년대로 예상됨)이며, 2016000보다 번호가 크면 후기 버전이라고 함.
아후... 이 정보도 참 구하기 어려웠다.

 이 모델은 특히 전몽각 선생님이 생전에 사용하시던 모델이여서 꼭 구하고 싶어서 장터 매복중 코스매틱한 버전으로 득템했다. 45년이 지난 바디인데도 노출계가 살아있다는것! 쌩쌩하게.....

Early Spotmatics were produced from July 1964 through 1965 sometime, as compared with 1965 through 1973 for the 'Late' version. It is historically interesting to note that Asahi produced their millionth SLR in 1966, so the early Spotmatics belong to the era before Asahi's millionth SLR was produced. The early models are relatively and can be dated to no later than 1965. There are subtle differences that give the early bodies away... differences include cosmetic differences in the self-timer lever, meter switch, top cover attachment method, and film counter height. There are also subtle differences in the focusing screen, lettering font, and even the strap triangle rings. The early part number was 231. The later model part number was 23102. Some appear to have these numbers on the baseplate, but not all. Serials can distinguish them as well... serials starting in the range 10nn800 but lower than 2016000 are early, while 2016000 and above are late models.

Standard Lenses: Super-Takumar 50mm f/1.4 or 55mm Super-Takumar f/1.8 with fully automatic diaphram. Distance scale: 0.45m (1.5 feet) to infinity. Filter size: 49mm. With depth-of-field scale. Equipped with diaphragm preview lever which affords visual check of depth of field. Distance Scale: 45cm (18') to infinity.

Shutter: Focal plane shutter with single non-rotating dial (dial rotates to select shutter speed but remains stationary when exposure is made - this is a reference to earlier cameras that had shutter speed dials that rotated when the exposure was made). Speeds: B, 1-1/1000 sec. Film speed (ASA) setting dial and window on shutter speed dial. Built-in self-timer releases shutter in 5-13 seconds. Shutter curtains of special rubberized silk.

Asahi Pentax Spotmatic
Also marketed as Honeywell Pentax Spotmatic	Year introduced 1964	Year discontinued 1973	Mount M42
Automatic aperture stop down Yes	Metering Stop down, centerweight	Meter range EV 1 to 18	ISO range 20 to 1600
DX ISO range No DX coding	Exposure modes Manual, B	Exposure compensation Not applicable	Exposure memory lock No
Shutter speeds (auto) Not applicable	Shutter speeds (manual) B, 1 - 1/1000s	Shutter speeds (mechanical) B, 1 - 1/1000s	Self timer Yes, 5 - 13s
Mirror lock-up No	Auto bracketing Not applicable	Multiple exposures Yes	Winder Ratchet type rapid wind lever. 10° pre-advance and 160° advance angle
Flash hot shoe No	Built-in flash No	TTL/P-TTL flash No	Flash sync speed FP and X terminals - 1/60s
Flash exposure comp Not applicable	Viewfinder 0.88x (with 50mm lens)	Viewfinder type Pentaprism finder with Fresnel lens + microprism	Diopter correction No
Exchangeable screen No	Depth of field preview Yes	Image size 24 x 36 mm	Battery 1.3V mercury PX-400
Size (W x H x D) 143 x 92 x 88mm (with standard lens)	Weight 621 g

From PentaxForums.com: http://www.pentaxforums.com/camerareviews/pentax-spotmatic.html#ixzz28uAgx5Rm