RARE VINTAGE 1960s MECHANICAL BOWLER COUNTESS CALCULATOR WITH COVER 5.3" x 6.7

RARE VINTAGE 1960s MECHANICAL BOWLER COUNTESS CALCULATOR WITH COVER DISTRIBUTED BY BOWLER PRODUCTS LTD. (LONDON) IN VERY GOOD CONDITION. MEASURES 5.3" x 6.7" x 5.1". THIS IS A DISK CALCULATOR FOR ACCUMULATIVE ADDING - IT IS A £sd CURRENCY MODEL.