RARE VINTAGE ANTIQUE UNRESTORED BUFF & BERGER SURVEYOR'S TRANSIT (SERIAL #888) WITH THE ORIGINAL WOODEN BOX, I DON'T KNOW ANYTHING ABOUT IT OR HOW IT WORKS, I DO KNOW WHEN THE LENS CAP IS REMOVED THAT YOU CAN'T SEE CLEARLY THROUGH IT, THE LEATHER STRAP IS NOT GOOD, THERE IS A KEYHOLE BUT THERE IS NO KEY, WHAT YOU SEE IS WHAT YOU GET, SEE PICTURES FOR CONDITION AND DESCRIPTION