I would just check it out myself first by lifting your presser foot, lowering your needle and sliding a flat metal ruler from the right side of the needle out from that and see if there are any marked or indented lines indicating any measurement.
If there are no markings, you might have a needle lever that will move your needle to where you can measure 1/4" seam allowances. Without seeing your machine, I can't suggest any thing else right now.