Shuzan for Yasuda
Shuzan - Different Marks and possible different period:
秀山 Meijo-Taisho period, 朱山 19th c. Meiji period, 珠山Meiji (also read as Jusan)
SOZAN Sozan can be written in different ways. The most important is素山
素山
祖山
蘇山
宋山
宗山
淙山
Sozan with Kinkozan mark