HEIGHT = 6 3/4 inches
WIDTH = 5 3/4 inches
VALUE = $175 - $325

MARKING:
A M GREENBLATT
STUDIO # 49

Note :
This doorstop is also made by other unknown foundries

with Maker's Mark 1175 on the back

with Maker's Mark 9812 with Peable finsh and with what appears to be a C in the middle

with Maker's Mark: 2 on the back