Looks like a Bel Air Precision (Royal?) I recently saw. I've learned the specs were very precise on the Japanese clones so they could capture some of the market after WWII. It is a clone of the Singer 15 - good machine for piecing, quilting. I could still kick myself that I passed on the one I saw in a cabinet for only $45.00.
I'd offer a bit less & see if they'll accept.