I have an unmarked NOS 46 tooth steel crankset that appears to be of good quality and is very unusual. It is what I would call a four piece set...two arms, an axle and a replaceable chainring. The chainring is held in place with a large 2 inch lockring from the inside. Ther axle is cotterless and square in section like modern axles and has two retaining bolts that thread on to the axle.
It came with a botttom bracket set that works very similar to headset.The axle has no integral bearing surfaces. There are two press-in cups, two cones, two locknuts and washers. However, the two cups are non standard...they appear to be about a eighth of an inch larger than other threadless bottom brackets.I thought it was the same size as the Baylis-Wiley sleeved BB's but this is not the case.
Any ideas what this is and what model of bike it may have come from?