It is (using birch ball) wooden abacus. It is 4-Ball 23 digits. It is (using birch ball) wooden abacus [Features]-4 Ball / 23 digits. You can use it for a long time and very easy to use. It is also useful to draw a line above frame, as it is has become a triangle ruler.
Additional information
Weight | 0.222 kg |
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brand | Tomoe |
dimensions | |