Correct, it is a Akro corkscrew. Made in Clarksburg WV. In this condition worth about ten to twenty five cents. Mint worth about $1.00 - $3.00. A mint four color Akro cork can be worth $100.00. The marble might be very rare but if condition is not high near mint or mint the value drops 50% to 75%. Condition is the most important to collectors, not age, not style, not colors, not rare, etc. It needs to be nm+ to mint to have much value at all.