While the early years focused on the manufacture of chiming wall and mantel clocks, Howard Miller also produced trend-setting avant garde clocks that stand today in collectors' galleries. During World War II, Howard Miller joined forces with the Ford Motor Co. to produce anti-aircraft covers. In the 1960s, the company turned its attention to grandfather clocks, eventually earning the company the title of "World's Largest Grandfather Clock Manufacturer."
Its not of great age or collectability, new today between $2000 - $3000 so second hand $200 is not unreasonable but i would ? that this is its real value, $100 - $120 is more realistic from a dealer, he has to make a profit.
The market for longcase clocks is rock bottom 19th C ones start at in UK start at $300 & can only now go up.
The date of manufacture will be its registration date which should be on a paper label somewhere inside the clock
Its of decorative value, not antique value, grandmother clocks are worth less than grandfather as a rule of thumb for similar clocks. Personally i would add the extra & buy at auction the best 8 day movement clock i could afford, but you must make the decision, buy with your head, not your heart in this case