Here's a photo of the bits 'n pieces that go to make up a scarce Pattern No. 3 tool that was made by the firm of Richard & William Aston of Birmingham, probably in late 1858. The tool's parts are extensively covered with letter and number marks, especially a 4 over 60 or as seen on the tool's body: a 4 beside the number 60.
I believe the 4 may be a unit number, say for a battalion and the 60 an equipment number. Perhaps the "B" is a Company letter. I have one other Pattern No. 3 tool where the tool's body is marked "4 60 K 1".
I'd certainly appreciate any ideas, thoughts or references that you might have about these markings.