Could it be a milk bottle cap?
This book cover is why I sometimes consider entering the used book trade. Love it.
I think abelian is right. You can see the place in the center where you can raise a tab to pull the cap off.
Could it be a milk bottle cap?
ReplyDeleteThis book cover is why I sometimes consider entering the used book trade. Love it.
ReplyDeleteI think abelian is right. You can see the place in the center where you can raise a tab to pull the cap off.
ReplyDelete