Every sewing machine manufacturer had feet that were proprietary to the company. Sometimes when companies merged thay took on some of the patents and sometimes they kept on rolling and adapted their feet to the new acquisition. Singer did this when they bought out Wheeler and Wilson. The 66-1 and 66-3 had the W&W styled feet on them and then it was decided it was not a viable transition and they dropped that type of foot all together.
New Home, White and a few others used a foot similar to that one and they turn up by the hundreds at thrift stores. The stores in my area sell the feet for .25 a foot so they are affordable.
Billy