The 1997 Barnett whiskey book lists this bottle as dating from 1888 to 1905. He had it priced at 25 to 35 dollars for an applied top version and 15 to 25 for the tooled top example. Not sure what today's prices are but should be pretty close to that I would think. Nice looking bottle, hope this helped.
Tried to do some searching pertaining to your bottle but came up empty . I see Carpetbagger has found some info for you . I have turned your bottle upright to get a better view of it , or at least I hope it does .
I'm sure there were other distributors with the name Monogram, but the Rieger Company of Kansas City had a Monogram whiskey. Lots of whiskey was bottled in Kansas City and sold to the western states before prohibition. Some research might be in order to find out which Monogram Whiskey Mr. Greenbaum was the sole agent.