Looking in the Gilbert Clocks book by Tran Duy Ly, it looks like a Gilbert's No. 3085-A on page 67. The 2000 price guide that comes in the Supplement shows a value of $225 for a clock in mint condition. I'm sure the clock has appreciated in value in the last 6 years.
If your clock is in good shape you got a good deal. The problem with buying on ebay is that you are never sure what kind of shape the clock is in. Even when the sellers say they just had the clock cleaned and its in great running condition, that's not always the case. Hence even clocks in good condition get less than they should on ebay.