German precision watch with rare movement quality Circa 1900

Open faced Glashütte pocket watch by Dürrstein Dresden
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A fine German precision pocket watch with very rare movement quality, probably made in Glashütte (possibly school watch), circa 1900. 14 carat gold engine turned case, signed with Union bell punch; Union precision lever movement, very rare and best movement quality with typical Glashütte characteristics, quality 1A with 3/4 plate, screwed gold chatons, gold lever and gold escape wheel; signed white enamel dial (minimal peripheral craquelling) with Roman hours, sunk subsidiary dial for the Arabic seconds and blued steel spade hands.
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Diameter: 50 mm
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Weight: 89 g
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Signed: Paul Römer Königstein Elbe
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The special movement quality corresponds to the designation on the dome. Due to the fact that the movement is not numbered, but the case has a four-digit number and the dial is signed with the name Paul Römer, it may be a Glashütte school watch.