This is an old European F scale (there were quite a few of these!). If you seArch for old f scales you will be able to find the right one.
The F series was well thought of and this RR/Aplanat design was made up to WW1 at least.
Fully open, it is an modern F 14. Covers 18x24cm and 105 degrees.
Thanks for your useful explanation and for your prompt reply
Maybe the Stolze System? https://camerosity.wordpress.com/con...ering-systems/
No, it's the "Goerz system" in the very helpful link above. 24 is equivalent to f/16 of the modern scale and each full stop is half or double the previous one: 6/12/24/48/96/192/384 = 8/11/16/22/32/45/64.
Peter
c&c always welcome!
"The world just does not fit conveniently into the format of a 35mm camera." (W. Eugene Smith)
http://peter-yeti.jimdo.com
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