23-12-2018, 02:20 PM
(This post was last modified: 23-12-2018, 02:28 PM by Duncan Grimmond.)
I knew I had this somewhere...the inside cover of "Marking-out for Machinists" by Captain Richard Twelvetrees from Percival Marshall & Co
and here on eBay is an example of the very one I had
https://www.ebay.co.uk/itm/Small-Early-2...:rk:5:pf:0
and here on eBay is an example of the very one I had
https://www.ebay.co.uk/itm/Small-Early-2...:rk:5:pf:0