Obtained from specialized dealers in archaeological artifacts from Jomon, Yayoi, and Kofun.
Such items are quite rare to find for sale even in the antique dealer market.
Material: green mud schist

It is a polished stone tool with a symmetrical pickaxe-shaped head and a pair of raised knobs in the center.
A type of two-headed stone axe.
It was named "Dokko-Ishi" because of its resemblance to a Buddhist dokkosho.
Initially used as a stone axe, it was later transformed into a ceremonial tool.
Reference
kashiwashobo
Catalogue: Jomon Stone Artifact Dictionary (Jomon)
The upper left side of this material is an early example.
The lower you go, the newer the age.
This stone is of the same type as No. 4.
This shape is found in Saitama, Nara and Seto area.
The age is from the first half to the middle of the late Jomon period.
The ones from this period have a ceremonial and ritual character because they are too warped to be used as a stone axe as a practical tool.

SIZE
16cm×3.5cm×2.8cm
total weight: 265g
Condition: used / Some soiling, but generally in good condition.
Reference.
kashiwashobo
Stone tool dictionary 

Also we Always Combine Shipping when possible, to save you money !

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-----Shipping-----
It will be shipped by FedEx or Japan post depending on the delivery area.
There are areas where out-of-area fees of will be incurred in the Fedex.

FedEx:3-6days
Japan post :4-12days

-----About combine shipping-----
Please offer me the person who hopes for combined shipping.
I do combined shipping.
However, combined shipping is not possible by shape of items.
Hold assumes one week a limit.
I file for the shipment if I confirm a remittance.
Please request a combine shipping if you want, before your remittance.

-----Return policy-----
If you are not satisfied with your purchase, we can accept returns for refund within 30 days of receipt of your item.
Buyer should notify Seller via email to return any items.
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All returned items are required to be in good condition upon received.
Customer is responsible for the return postage.
Shipping fee is not refundable.
If a package is returned to us due to your refusal to accept it, the return postage will be deducted from your refund.
Even if the commodity is returned, I cannot repay the tariff.
Please inquire the repayment of the tariff of the customhouse in your country.
Please see our Return Policy for details.

-----About the tariff-----
*Import duties, taxes and charges are not included in the item price or shipping charges.
These charges are the buyer’s responsibility.
* Please check with your country’s customs office to determine what these additional
costs will be prior to bidding/ buying.

----- About used artifacts and antiques----
We make every effort to give you accurate information as honestly as possible in our description,
Some items are over 100 years old.
Please check the appearance condition with photos and other information.
The condition of the item is described in the Condition section, but please contact us if you have any questions before purchasing.