A fantastic vintage diatest. Made by Mercer and is 0,002 mm type 253 model. We have cleared a engineers workshop and know very little about this device. It is untested and very much as found. We have only waxed the wooden box. A great vintage piece.  
Condition
Untest and as found. Shows signs of wear and tear as it is old and has been used, but only adds to its character. Great decorative item which would look fantastic in any home or business interior.
Please look at photos closely as they form part of the item description.
Dimensions 
32 cm width, 9 cm depth, 5.5 cm height
About Us
We are a family business and love sourcing unusual pieces which bring a burst of individual style to the most modern of interiors, creating interiors with soul!
If you have any questions do get in touch via the website, retrovation.co.uk or find us on social media, just search Retrovation.
All pieces are packed using recycled cardboard and bubble wrap. 
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Thanks Dawn & Stephen