G'day vint_mow,
Another question, what kind of pins did they use to hold these badges on? Seems to have been used on all machinery prior to the days of pop rivets. I've found out the hard way that they are near impossible to remove successfully. Easiest way seems to be to cut them off.
They would be 'drive screws', like these:
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2016/02/full-5630-27165-drive_screws.jpg)
They are installed by hammering them into an undersized pilot hole, so as you say, it's very difficult to get them out.
About the only way is to punch them out from the underside, but this only works if the pilot hole is drilled through.
They are hardened, so drilling them out is also difficult.