Hartford Cycle Company was established in 1889 by Pope Manufacturing Company for the making of a cheaper grade of bicycle. 1897 Hartford Pattern Nos. were 1-2, 7-8 and 9-10.
Here are some pages from 1898 Pope Mfg. Company catalog which includes Columbia, Hartford (made by Hartford Cycle Co) and Vedette (first year model and made by Hartford Cycle Co.) bicycles.
1898 Hartfords are Pattern 7 & 8 only. Frames are lugged and crankset looks similar to yours, but fork crown image does not match yours.
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A couple 1897 -1898 Hartford Pattern 8's have sold at Copake over the years. They have fork crowns that match yours so maybe what is shown in the catalog was not always used in production or 1898 forks were carried over into 1899 on women's only until inventory ran out then they changed to the new fork design.
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1899 Hartford Pattern 19 fork crown matches catalog image.
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