I am looking at a Lee Enfield No4 Mk1* Longbranch that appears to have had the last 4 digits on the bolt struck by hand. The number font is larger, uneven and deeper strikes.

If there was a problem with the bolt, let's say headspace, and it couldn't be resulted was a bolt from the same lot taken and the matching rifle serial number stamped by hand?

Trying to understand why the mismatch of number fonts. Thanks