Edco are still in business:
I'm not sure why their web site is now .nl, but edco.ch redirects there too.
There was an edco-SAPIM connection a few years ago, and I've got a pair of very nice edco hubs that are Rigida branded, so maybe there's been some corporate to-ing and fro-ing.
In any case, if you have access to the cranks, it would help if you could measure the bcd yourself. Measure between the centres of two adjacent bolt holes and multiply by 1.7
The only edco cranks I've seen were more recent than yours (mid nineties), doubles, and used 130mm bcd.
Calmes dans le demi-jour
Que les branches hautes font,
Pénétrons bien notre amour
De ce silence profond.