I've just finished reading about frame sizes (again) beginning on page 527 and TPS confirms that the 1 1/2 frame was introduced around 1900 but that.... now get this.... a DH made in 1898 is known to have been built on the 1 1/2 frame.
Frank, you may well have the earliest known 1 1/2 frame Parker hammerless.
The markings on the barrel flats should be consistent with the era as well as the complete rib legend to confirm this.
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