Gauge blocks -- FCL

I have a set of steel gauge blocks and each block is either hand engraved or etched with the letter FCL.
Do these letters signify anything, or is it just a way of identifying
the blocks as part of the same set?
Alan
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Alan Bain wrote:

I've got blocks here with the original owners name on. Maybe something similar with yours?
Bob
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.