I have a pair of cranks like this and they are excellent shape. The chainguard is a cheapy plastic deal that snaps in. I took it out. It looks very interesting. The crankarms say S3 on the back of crankarm. The pedals are Lyotard but I can't seem to get them off with a standard pedal wrench. Any ideas on this vintage and if they are any good? I am hoping the bolt circle is 144. It is not 130...but bigger I believe. I found this pic on the web and they are very close to what I have.

https://www.touringonbikes.us/images/beaterbike5.jpg

The bolt circles look a lot like my SR Silstar crank that has a 118 BCD small ring and a large ring that was well beyond 151 BCD Turned it into a single speed crankset with a 52t 118 BCD ring and left the outer holes empty.

The chainring bolts were also smaller diameter than standard and I had to drill out the holes to mount the new ring.

Look here for easy BCD measuring