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Escapement
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Lever watch with pin-pallet escapement; dial, case and movement marked ´Roskopf Patent, Swiss made´. The German watchmaker Georges-Frederic Roskopf (... - SuperStock
Untitled Document
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The Pin-Pallet Escapement. Adjustment and Repair by Porter, Robert: Very Good Soft cover (1987) 1st Edition. | Ken Jackson