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12-03-2014, 12:17 AM   #1
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Question for 6x7 owners

The original 6x7 had a number of changes made to it over the years until finally being replaced by the 67. I'm trying to work out roughly when and in what order the changes happened. As far as I can tell these are the visible modifications that were made to the bodies:
1. Mirror reset added
2. Film spool locks changed from checkered plate to handles
3. Film selection changed from 21/10 to 220/120
4. Mirror lockup added
5. Serial number no longer painted white

1, 2 and 5 are in the correct sequence, but I'm not sure whether 3 and 4 happened at the same time or separately. Does anybody have a 6x7 which has MLU and still has the 21/10 film selector or conversely does anybody have a 6x7 with a 120/220 film sector but not MLU? If you do, what is the serial number?

Unfortunately some (or all) of these could be retrofitted so I am not always getting the right sequence, but with enough data a pattern will emerge. Technically there is a 6th change where the battery holder changes from chrome and black to just black, but given that this is a replaceable part it is too hard to be sure of anything there. The same applies with the finders changing from silver lettering to plain black.

thanks,

Paul Ewins

12-03-2014, 12:38 PM   #2
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The film spool locks were changed to the handle type during the non-MLU run. The oldest Asahi/Honeywell had checkered locks but my non-MLU Honeywell has handles. The S/N is 4033808. Mine seems to be a newer non-MLU model but still has the 21/10 shot indicator on the side. Mine has the white S/Ns as well. I have never seen an MLU model with the 21/10 shot indicator.
12-04-2014, 11:42 AM   #3
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I have a 6x7 MLU with 21/10 markings. SN: 4024972
12-04-2014, 02:31 PM   #4
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An older serial number than mine but with MLU? Very strange-- maybe the MLU was added as an option? Does yours have the chrome and black lens release lever?

12-04-2014, 05:53 PM   #5
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I'm not sure if the MLU was added? looks similar to the other ones I have seen, but I haven't really looked at them that hard. It does have the black and chrome release lever. I was thinking it was an early MLU model?

MLU switch:


Lens Release:


220/120 switch:
12-05-2014, 03:23 AM   #6
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Yes, that looks like a retrofit. So far the data points to the spool lock changeover happening around body number 4017000 and MUP and/or 120/220 being added somewhere between 4055000 and 4060000. I've seen another MUP model with a serial of 4035388 so I assume that it was available as a retrofit option. It looks like the back on yours has been modified to make it removable too.
12-05-2014, 09:23 AM   #7
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It seems by around 2nd quarter 1986 was when the changes to the MLU equipped "6X7" made the non-MLU part obsolete...

Maybe these bit of are of some use?

Discontinued Key Parts for old 6x7 (non MLU)
New Crank Handle style & cowling around
Newly designated Winding-Lever-Shaft-Assembly (120/220) & Counter to 20 not 21
New film spool release assemblies
Available factory modified for key parts to transition form old 6x7 with MLU
Available factory custom modified disconnect for double exposure

Not sure the order and dates yet.
12-05-2014, 10:17 AM   #8
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These are the release dates from an old Pentax web link:

6X7 Jul.'69
6X7 with mirror-up Jun.'76
67 Nov.'89
67II Nov.'98

And another Asahi web site:

110 and Medium Format

This is the only info I could find on s/n for the 6x7, other than the forum S/N DB:

67 & 67ii Serial Numbers List - Photo.net Medium Format Forum

Phil.

12-05-2014, 11:24 PM   #9
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Thanks guys, that's all very helpful.
12-07-2014, 04:01 PM   #10
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It's not really a reliable guide as to what parts appeared when and on what bodies when specifying the vintage of either of the Pentax bodies. It is known that the older 6x7 bodies would be retrofitted with the newer all-black lens release assembly and the 67s fitted with the snazzy chrome assemblies -- I have seen several unique examples of this locally. Cannibalising old bodies make this a reality: you can actually end up with quite a unique body from the bits and pieces that come off newer or older cameras, so long as attention is paid to compatibility e.g. I don't think winding mechanisms from the old 6x7s are retrofittable to the 67s.

The releaseable back was a factory modification much the same as the multi-exposure facility was. My framer had his 6x7 fitted with a monster roll-film back in the early 1980s that was a boon for his antiquarian gallery stock photography. It is sad to reflect that progressive arthritis had made his awkward handling of the beast an impossible reality by the late 1990s and in a fit of madness (it must have been!), he left the camera and all the lenses (about 8 lenses) out on the curb for recycling collection in 1999!
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