BG sample chip before so thanks for the advice.

Or did BG use this method when selling overstocks?

It's also possible the user hotstamped them too avoid slipping in of chips.
All the chips are probably from small casino's with some Golden Ten tables.
I have seen five tables and have around 15 balls for that game in collection now.
The chips have been used for years, the ones in the picture are the better ones.
The chips with the plain on are mint.

Thanks for all the advice.