This is a Showa-retro 5-bead abacus, suitable for 15 digits. The size is approximately 33 cm wide, 10.5 cm long, and 3 cm high. The back has the words "National Power Lamp" printed on it. Please refer to the last photo for information about the National Power Lamp. I believe items with the lettering are quite rare, so how about it for those who are interested!. Since this is an old item, please purchase only if you are not concerned about the condition shown in the photos. No price reduction for single items. #ShowaRetro #RetroGoods #NoveltyItems #National #NationalPowerLamp #Abacus #RetroAbacus #Soroban #RetroSoroban #AntiqueTools #AntiqueGoods #Brocan #RareItem