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early British head of camera obscura with adjustable prism, in very good original condition, engraved 'Watson & Sons, High Holborn London', total height c.17cm, focal length of the prism c.70cm
€ 700 | 2020-06-08 09:10 |
€ 650 | 2020-06-10 15:30 |
€ 500 | Start price |