If you search APUG, you'll find a few posts about using Ilford Line film. I have some data for N.25 and N.30, and the speed is quoted at ASA Weston 3 in daylight. ASA Weston 0.8 for tungsten light - ASA Weston 3 converts to ASA DIN 6.
Develop for 3.25min in ID11 or 4min in Microphen (N5.30 & N.30 film/plates) - If nothing else, it gives you a starting point for N5.50.
As for "how old", it probably dates to the 1950s, early 1960s.
Last edited by paul_c5x4; 02-02-2014 at 06:26 AM. Click to view previous post history.