MRC:
The lettering or design on the item,or that is the item.AYBM
Inscription:
1st inscription: drive, constant speed; 2nd inscription: mechanical s/n; 3rd inscription: code/part no.; 4th inscription: output rating --- at --- rpm; 5th inscription: input speed --- rpm; 6th inscription: system oil ---; 7th inscription: specification no.; 8th inscription: conf. Item no; 9th inscription: us nsn; 10th inscription: contract; 11th inscription: sundstrand aviation; 12th inscription: div. On sundstrand corp.; 13th inscription: mfd. In rockford, ill. U.S.A. 1st side