Simon Worsley over at the Zeiss Ikon Camera Group (ZICG) has been collecting these numbers for some years and can offer fairly accurate dates for most ICA and ZI cameras.
https://groups.yahoo.com/neo/groups/ZICG/conversations/messages
Here’s another one:
ICA Ideal 245
ICA Lens 120/5.6 #258816 (probably not orginal, since the infinity-setting was moved)
Compound Shutter #N2218999
Base #47723
Back #C84424
So the C should mean it’s built around 1913?
I have an Ica marked Ideal, I'll try to remember to look for the body serial and post that along with the lens serial when I'm home. Given it's a bayonet lens mount, I don't know how much confidence we could have that the lens is original, though.
...about the bayonet mount: that mount was only specific for ICA camera's (Zeiss changed the bayonet); so changes are big you have the original matching shutter/lens combo.
My ICA Ideal has a 13,5 cm Tessar in dial set Compur. I've sometimes noticed scribed lines on the rails to mark infinity, but not on this one. Max extension approx 250mm. Maybe this lens bayonet was more like a marketing gimmick.I also have a Zeiss 9x12 Ideal with what seems to be the same bayonet type, except it's a different diameter front standard opening. The Ica has a 15 cm f/4.5 Tessar in dial-set Compur, while the Zeiss has a 13.5 cm f/4.5 Tessar in a slightly smaller dial-set Compur. Given these cameras don't have adjustable infinity stops or multiple focus scales, I've wondered what good the bayonet would be -- I guess for longer lenses you could just extend the bed further (at least one of the two is double extension, IIRC), but you'd have to eyeball the lock position for, say, a 110 mm or similar -- or just leave the standard in the retracted position and crank out the bed...
Maybe this lens bayonet was more like a marketing gimmick.
My ICA Ideal has a 13,5 cm Tessar in dial set Compur. I've sometimes noticed scribed lines on the rails to mark infinity, but not on this one. Max extension approx 250mm. Maybe this lens bayonet was more like a marketing gimmick.
Zeiss system indeed looks the same as Ica with two posts. Making tabs for lenses shouldn't be too difficult.
Ica and Zeiss Ikon bayonets are not compatible : to lock with Z I , you must turn clockwise, it's counter-clockwise with Ica.
The majority of Ica cameras don't have a bayonet mount.
Ideal models do have one (but not 6 x 9 models).
Sometimes a shutter with its lens can be mounted on other cameras. Here are 3 cameras : shutters of the 9 x 12 and the 10 x 15 cameras are compatible with the 13 x 18 camera, but shutters of 10 x 15 and 13 x 18 are not with 9 x 12 camera, because of their too big lens diameter, even when the bayonet fasteners are of the same diameter on the 3 cameras.
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