Our Trademark
Our trademark is a Diamond B; every five years we add a line to it, so you can determine when the item was produced.
| First five years (1978-1983)  |
Second five years (1983-1988)  |
Third Five Years (1988-1993)  |
| Fourth Five Years (1993-1998)  |
Fifth Five Years (1998-2003)  |
Sixth Five Years (2003-2008)  |
| Seventh Five Years (2008-present)  |