The last version 15 class version (15K1xx) from Scotland also has the drop feet mechanism on the bed but it is rare. Most common is the crone / adaptation of China and Taiwan. new one such as this cost US$200 here. I won't say the quality of the crone / adaptation is inferior, as in the case of china the adaptation of the 15-80 is classified by the chinese authority as JB1-1 (domestic sewing machine), this classification enable interchange of components from different factories. Started in 1945 up to the present, if there are of inferior quality they would have long being abandoned, but rather the crone / adaptation under different brands (from different factories) have demonstrate reliability and hold their vintage value (like the Singer) in the chinese market.