I have a flash that I inherited from my father. It's taken a long time to decide that it was meant to be used. I read on a bamboo board that they are probably a 6-wt. I measured mine with the CCS and it has an ERN of 7.4 and an AA of 60. I think the ERN is a little high. The handle didn't fit my fixture well and not wanting to damage the cork, I didn't tighten it down real hard. I would start with a WF-6-F and see how it loads.

Larry